Fluid analysis method and fluid analysis device

Abstract

To provide a fluid analysis method that, in fluid analysis in a processor having a plate-like member, can appropriately determine a solution of fluid near the plate-like member while reducing an amount of calculation.SOLUTION: There is provided a fluid analysis method in a processor including a plate-like member in contact with fluid, and the fluid analysis method includes: a geometric model creation step of creating a geometric model of the processor; and an analysis step of performing simulation of the fluid in the processor by a finite volume method by using the geometric model of the processor. When the total lengths of three sides of the processor is L, a thickness of the plate-like member is 1 / 150L or less. The geometric model creation step includes creating the geometric model so that, in a cross section perpendicular to a side face along the thickness direction of the plate-like member and along the thickness direction, the side face becomes an inclined plane with a length of 0.001L or more and 1 / 30L or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fluid analysis method and a fluid analysis device. [Background technology]

[0002] 2. Description of the Related Art Analysis of fluids in processing equipment such as mixing vessels and reaction vessels has been conventionally carried out for the purpose of optimizing the operating conditions of the processing equipment.

[0003] Various methods are used as methods for analyzing fluids, and for example, the finite volume method as disclosed in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-189316 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, various treatment devices such as stirring tanks may be provided with plate-like members such as baffles and stirring blades. When the thickness of the plate-like members is sufficiently thin compared to the size of the treatment device, a geometric model of the treatment device has been created by setting the thickness of the plate-like members to 0 in order to reduce the amount of calculation when performing fluid analysis using the finite volume method.

[0006] However, when a geometric model of the treatment device is created with the thickness of the plate-like member set to 0 and fluid analysis is performed using the finite volume method, depending on the fluid flow velocity near the plate-like member and the mesh size, the solution may be a flow field that penetrates the plate-like member, requiring recalculation.

[0007] In view of the problems associated with the above-mentioned conventional techniques, one aspect of the present invention aims to provide a fluid analysis method capable of appropriately finding a solution for the fluid in the vicinity of a plate-like member while reducing the amount of calculations required in fluid analysis within a processing device having a plate-like member. [Means for solving the problem]

[0008] In order to solve the above problem, according to one aspect of the present invention, A method for analyzing fluid in a processing device including a plate-like member that contacts a fluid, comprising: a geometric model creation step of creating a geometric model of the processing device; and an analysis step of performing a simulation of the fluid in the processing device by a finite volume method using the geometric model of the processing device, The processing device Tank When the total length of the three sides is L, the thickness of the plate-like member is 1 / 150L or less; The present invention provides a fluid analysis method in which, in the shape model creation process, the shape model is created so that, in a cross section perpendicular to a side surface along the thickness direction of the plate-like member and along the thickness direction, the side surface has an inclined surface with a length of 0.001L or more and 1 / 30L or less. Effect of the Invention

[0009] According to one aspect of the present invention, it is possible to provide a fluid analysis method that can appropriately obtain a solution for a fluid in a processing device having a plate-like member while suppressing the amount of calculation. [Brief description of the drawings]

[0010] [Figure 1] 1A to 1C are explanatory diagrams of a shape model of a plate-like member and a mesh that can be set, which are created in a fluid analysis method according to an embodiment of the present disclosure. [Diagram 2] 13 is an explanatory diagram of a mesh that can be set when the thickness of a plate-like member is set to 0. FIG. [Diagram 3]13 is an explanatory diagram of a mesh that can be set when a plate-like member is given thickness. FIG. [Figure 4] 1 is a hardware configuration diagram of a fluid analysis apparatus according to an embodiment of the present invention. [Diagram 5] 1 is a block diagram showing functions of a fluid analysis apparatus according to an embodiment of the present invention. [Figure 6] 1 shows the results of a fluid analysis of Example 1. [Figure 7] 1 shows the results of fluid analysis of Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The following describes a form for carrying out the present invention. However, the present invention is not limited to the following embodiment, and various modifications and substitutions can be made to the following embodiment without departing from the scope of the present invention. [Fluid analysis method] The fluid analysis method of this embodiment will be described.

[0012] The fluid analysis method of the present embodiment relates to a method for analyzing fluid in a processing apparatus including a plate-like member that comes into contact with a fluid. The fluid analysis method of the present embodiment may include the following shape model creation step and analysis step.

[0013] In the geometric model creation step, a geometric model of the processing device can be created.

[0014] In the analysis step, a simulation of a fluid in the processing device can be performed by a finite volume method using the geometric model of the processing device created in the geometric model creation step.

[0015] The treatment device used in the fluid analysis method of this embodiment is not particularly limited. Various treatment devices having a plate-like member can be used in the fluid analysis method of this embodiment. For example, the treatment device can be a stirring tank, and the plate-like member can be one or more types selected from baffles, stirring blades, etc.

[0016] Each step will be described below. (1) Geometric model creation process In the geometric model creation step, a geometric model of a processing device that performs fluid analysis, i.e., fluid simulation, can be created.

[0017] As mentioned above, when the thickness of the plate-like member is sufficiently thin compared to the size of the processing device, when performing fluid analysis using the finite volume method, the thickness of the plate-like member is set to 0 to create a geometric model of the processing device in order to reduce the amount of calculations.

[0018] Specifically, as shown in FIG. 2, the plate-like member 20 has a thickness of 0. Note that in FIG. 2, the plate-like member 20 is depicted with a constant thickness for convenience of notation. By setting the thickness of the plate-like member 20 to 0 in this manner, for example, the meshes 21 to 23 provided at the end 201 of the plate-like member 20 can be set to any size without being affected by the thickness of the plate-like member 20. For this reason, for example, the meshes 21 to 23 can be set to the same size, and the width and number of the meshes can be suppressed, and the amount of calculation can also be suppressed. Note that FIG. 2 and FIGS. 1 and 3 described below merely show examples of meshes that can be set, and only a portion of them is shown.

[0019] However, when a geometric model of the treatment device was created using a two-dimensional model with the thickness of the plate-like member set to zero and fluid analysis was performed using the finite volume method, depending on the fluid flow velocity near the plate-like member, the mesh size, etc., the solution sometimes was a flow field that penetrated the plate-like member.

[0020] For this reason, a method of creating a shape model according to the actual thickness of the plate-like member may be considered. In this case, the plate-like member 30 is given a thickness as shown in Fig. 3, resulting in a plate-like member with a plate thickness T30.

[0021] However, when the plate-shaped member 30 has a thickness T30, the mesh 31 in contact with the side surface 301 along the thickness direction must be sized to match the plate thickness T30 of the plate-shaped member 30. In addition, the adjacent mesh 32 cannot be made suddenly larger than the mesh 31, so the sizes must be increased in the order of mesh 31, mesh 32, and mesh 33. This results in a problem of an increased amount of calculations, as the minimum size of the meshes becomes smaller and the types and number of sizes of meshes to be arranged in the processing device become enormous.

[0022] The inventors of the present invention conducted a study and found that the side surface of the plate-like member along the thickness direction can be made into an inclined surface in a cross section perpendicular to the side surface along the thickness direction, and thus completed the present invention. By making the side surface into an inclined surface, it is not necessary to arrange a small-sized mesh on the side surface, and a solution for the fluid in the vicinity of the plate-like member can be appropriately obtained.

[0023] Specifically, the total length of the three sides of the processing device is defined as L. In this case, in the shape model creation step, a shape model can be created such that the side surface of the plate-like member is an inclined surface with a length L101 (see FIG. 1) of 0.001L or more and 1 / 30L or less in a cross section perpendicular to the side surface along the thickness direction of the plate-like member and along the thickness direction.

[0024] The total length of the three sides of the treatment device means the total length of the maximum width, depth, and height of the treatment device used in the fluid analysis. In the case of a cylindrical mixing vessel, it can be, for example, the diameter of the bottom surface x 2 + height.

[0025] Fig. 1 shows an example of a shape model created for a plate-like member. Fig. 1 is a cross-sectional view on a plane along the thickness direction of the plate-like member 10 and is perpendicular to the side surface 101. For the plate-like member 10 shown in Fig. 1, the side surface 101 is an inclined surface as described above. By making it an inclined surface in this way, a mesh 11 that matches the length of the side surface 101 can be set, and it is not necessary to set a small mesh with the length of one side adjusted to the thickness T10. Also, meshes 12 etc. arranged around the mesh 11 can be meshes of a sufficient size similar to the mesh 11. Therefore, it is possible to suppress the reduction in the minimum size of the mesh and prevent an increase in the types and number of mesh sizes.

[0026] Also, since the plate-like member 10 has a thickness T10, when performing fluid analysis by the finite volume method, it is possible to prevent the flow field passing through the plate-like member from becoming a solution. Note that the thickness T10 satisfies 0 < T10.

[0027] Therefore, in the shape model creation process, by making the side surface of the plate-like member the above shape, in the fluid analysis in the processing apparatus having the plate-like member, it is possible to appropriately obtain the solution of the fluid near the plate-like member while suppressing the calculation amount.

[0028] Note that since a plate-like member with an inclined side surface as described above is sufficient only for a member with a small thickness, for a plate-like member with a thickness of, for example, 1 / 150L or less, in the shape model creation process, the side surface can be made an inclined surface as described above. (2) Analysis process In the analysis process, using the shape model of the processing apparatus created in the shape model creation process, fluid simulation in the processing apparatus can be performed by the finite volume method.

[0029] The specific analysis method can be performed by the normal analysis method in the finite volume method and is not particularly limited. (3) Other processes In the fluid analysis method of this embodiment, after performing a shape model creation process, but before performing an analysis process, a condition setting process can be performed in which meshes are set in the shape model, which are necessary for the analysis, and conditions are set for the analysis.

[0030] Furthermore, the fluid analysis method of the present embodiment may also have an output step of outputting the obtained analysis results, as necessary. The form of output in the output step is not particularly limited, and it may be possible to simply output data of the analysis results, or to output data in which the movement of the fluid or the like is visualized. [Fluid analysis device] The fluid analysis apparatus of this embodiment will be described.

[0031] The fluid analysis device of this embodiment can implement the fluid analysis method described above, and therefore some of the matters that have already been described will not be described again.

[0032] The fluid analysis device of this embodiment is a device that performs fluid analysis within a processing device including a plate-like member that comes into contact with a fluid. The fluid analysis device of this embodiment may have the following shape model creation unit and analysis unit.

[0033] The processing device used for the analysis by the fluid analysis device of this embodiment is not particularly limited. Various processing devices having a plate-like member can be used for the analysis by the fluid analysis device of this embodiment. For example, the processing device may be a stirring tank, and the plate-like member may be one or more types selected from baffles, stirring blades, etc.

[0034] The geometric model creation unit can create a geometric model of the processing device.

[0035] The analysis unit can use the geometric model of the processing device to perform a simulation of the fluid in the processing device by the finite volume method.

[0036] As shown in the hardware configuration diagram of Fig. 4, the fluid analysis device 40 of this embodiment is composed of, for example, an information processing device (computer), and can be physically configured as a computer system including a CPU (Central Processing Unit: processor) 41 which is an arithmetic processing unit, a RAM (Random Access Memory) 42 and a ROM (Read Only Memory) 43 which are main storage devices, an auxiliary storage device 44, an input / output interface 45, and a display device 46 which is an output device. These are connected to each other by a bus 47. The auxiliary storage device 44 and the display device 46 may be provided externally.

[0037] The CPU 41 controls the overall operation of the fluid analysis device 40 and performs various information processing. The CPU 41 executes, for example, a program (fluid analysis program) described later that is stored in the ROM 43 or the auxiliary storage device 44, and can perform analysis of the fluid in the processing device, etc.

[0038] The RAM 42 is used as a work area for the CPU 41 and may include a non-volatile RAM for storing main parameters and information.

[0039] The ROM 43 can store programs (fluid analysis programs) and the like.

[0040] The auxiliary storage device 44 is a storage device such as an SSD (Solid State Drive) or an HDD (Hard Disk Drive), and can store various data, files, etc. necessary for the operation of the simulation device.

[0041] The input / output interface 45 includes both a user interface such as a touch panel, keyboard, display screen, and operation buttons, and a communication interface that takes in information from an external data recording server, etc., and outputs analysis information to other electronic devices.

[0042] The display device 46 is a monitor display, etc. An analysis screen is displayed on the display device 46, and the screen is updated in response to input / output operations via the input / output interface 45.

[0043] Each function of the fluid analysis device 40 shown in FIG. 4 can be realized by loading a program (fluid analysis program) or the like from a main storage device 44 such as a RAM 42 or a ROM 43 and executing it by the CPU 41, thereby reading and writing data in the RAM 42, etc., and operating the input / output interface 45 and the display device 46.

[0044] FIG. 5 shows a functional block diagram of a fluid analysis device 40 of this embodiment.

[0045] 5, the fluid analysis device 40 can have a receiving unit 51, a processing device 52, and an output unit 53. These units are realized by software and hardware working together in an information processing device such as a personal computer equipped with a CPU, a storage device, various interfaces, etc., of the fluid analysis device 40, by the CPU executing a program stored in advance, for example, as described below.

[0046] The configuration of each part will be explained below. (1) Reception The reception unit 51 receives input of commands and data from a user related to the processing executed by the processing device 52. Examples of the reception unit 51 include a keyboard or mouse operated by a user to input commands, a communication device for inputting via a network, and a reading device for inputting from various storage media such as a CD-ROM or DVD-ROM.

[0047] The receiving unit 51 can receive, for example, structural parameters of the processing device, various conditions required for performing fluid analysis, and the like. (2) Processing equipment The processing device 52 can include a shape model creation unit 521 and an analysis unit 522 . (2-1) Shape model creation section The geometric model creation unit 521 can create a geometric model of the processing device.

[0048] In this case, when the total length of the three sides of the processing device is L, the shape model creation unit can create a shape model such that the length of the side surface is an inclined surface that is perpendicular to the side surface along the thickness direction of the plate-like member and is in the thickness direction, and is inclined from 0.001L to 1 / 30L inclusive. Note that the thickness of the plate-like member having an inclined side surface is 1 / 150L or less. (2-2) Analysis section The analysis unit 522 can perform a simulation of the fluid in the processing device by the finite volume method using the geometric model of the processing device. (3) Output section The output unit 53 may have a display or the like. The analysis results obtained by the analysis unit 522 may be output to the output unit 53. The form of output is not particularly limited, and the data of the analysis results may simply be output, or data in which the movement of the fluid or the like is visualized may also be output.

[0049] In addition, the fluid analysis device of this embodiment may further have, as necessary, a condition setting unit that sets meshes in the shape model required for the analysis and sets conditions required for the analysis after creating a shape model in the shape model creation unit and before performing the analysis in the analysis unit.

[0050] According to the fluid analysis device of the present embodiment described above, in fluid analysis within a processing device having a plate-like member, it is possible to appropriately obtain a solution for the fluid in the vicinity of the plate-like member while suppressing the amount of calculation. [Fluid analysis program] Next, the fluid analysis program of this embodiment will be described.

[0051] The fluid analysis program of this embodiment relates to a fluid analysis program for performing fluid analysis within a processing device including a plate-like member that comes into contact with a fluid, and can cause a computer to function as a shape model creation unit and an analysis unit described below.

[0052] The geometric model creation unit can create a geometric model of the processing device.

[0053] In this case, when the total length of the three sides of the processing device is L, the shape model creation unit can create a shape model such that the length of the side surface is an inclined surface that is perpendicular to the side surface along the thickness direction of the plate-like member and is in the thickness direction, and is in the range of 0.001L to 1 / 30L. Note that the thickness of the plate-like member is 1 / 150L or less.

[0054] The analysis unit can use the geometric model of the processing device to perform a simulation of the fluid in the processing device by the finite volume method.

[0055] The fluid analysis program of this embodiment can be stored in various storage media such as the RAM, ROM, and other main or auxiliary storage devices of the fluid analysis device described above. By loading the program and executing it with the CPU, data can be read and written in the RAM, etc., and the input / output interface and the display device can be operated and executed. Therefore, the items already described for the fluid analysis device will not be described.

[0056] According to the fluid analysis program of the present embodiment described above, in fluid analysis within a processing device having a plate-like member, it is possible to appropriately obtain a solution for the fluid in the vicinity of the plate-like member while suppressing the amount of calculation. EXAMPLES

[0057] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to the following examples. [Example 1] The movement of fluid during stirring was analyzed in a treatment device that was a stirring tank having baffles as plate-like members, using the following procedure. (Shape model creation process) In the shape model creation process, a shape model was created based on the actual shape of the mixing vessel.

[0058] In addition, when the total length of the three sides of the mixing vessel is L, for a baffle plate having a thickness of 1 / 150L or less, a shape model was created so that the side surface is an inclined surface with a length of 0.004L in a cross section perpendicular to the side surface along the thickness direction of the baffle plate and along the thickness direction. Since the mixing vessel analyzed has a baffle plate with a thickness of 1 / 1500L, the side surface of the baffle plate is inclined as described above. (Analysis process) In the analysis step, a simulation of the fluid in the treatment device was performed by the finite volume method using the geometric model of the treatment device created in the geometric model creation step.

[0059] Before the analysis step, a mesh was set in the geometric model, and conditions such as boundary conditions were set (condition setting step).

[0060] Figure 6 shows a visualization of the analysis results obtained.

[0061] As shown in FIG. 6, it was confirmed that the phenomenon of the fluid 62 penetrating the baffle plate 61 did not occur. [Comparative Example 1] In the geometric model creation process, the movement of the fluid in the mixing vessel was analyzed in the same manner as in Example 1, except that the baffle plate was made to have a two-dimensional shape with a thickness of 0.

[0062] Figure 7 shows a visualization of the analysis results obtained.

[0063] As shown in FIG. 7, it was confirmed that the phenomenon occurred in which the fluid 72 penetrated the baffle plate 71.

[0064] In addition, the minimum mesh size was the same in Example 1 and Comparative Example 1, and in Example 1, the occurrence of the phenomenon in which the fluid penetrates the baffle plate was prevented as described above.

[0065] Therefore, in the first embodiment, in the fluid analysis in the processing device having the plate-like member, it was confirmed that the amount of calculations could be suppressed and a solution for the fluid in the vicinity of the plate-like member could be appropriately obtained. [Explanation of symbols]

[0066] 521 Shape Model Creation Department 522 Analysis Department

Claims

1. A method for analyzing fluid in a processing device including a plate-like member that contacts a fluid, comprising: a geometric model creation step of creating a geometric model of the processing device; and an analysis step of performing a simulation of the fluid in the processing device by a finite volume method using the geometric model of the processing device, When the total length of three sides of the tank of the treatment device is L, the thickness of the plate-like member is 1 / 150L or less; A fluid analysis method in which, in the shape model creation process, the shape model is created so that in a cross section perpendicular to a side surface along the thickness direction of the plate-like member and along the thickness direction, the side surface has an inclined surface with a length of 0.001L or more and 1 / 30L or less.

2. 2. The fluid analyzing method according to claim 1, wherein the processing device is a stirring vessel, and the plate-like member is one or more types selected from the group consisting of a baffle plate and a stirring blade.

3. A fluid analysis device for performing a fluid analysis in a processing device including a plate-like member that comes into contact with a fluid, a shape model creation unit that creates a shape model of the processing device; and an analysis unit that performs a simulation of the fluid in the processing device by a finite volume method using the shape model of the processing device, When the total length of three sides of the tank of the treatment device is L, the thickness of the plate-like member is 1 / 150L or less; The shape model creation unit of the fluid analysis device creates the shape model so that, in a cross section perpendicular to a side surface along the thickness direction of the plate-like member and along the thickness direction, the side surface has an inclined surface with a length of 0.001L or more and 1 / 30L or less.

4. 4. The fluid analysis device according to claim 3, wherein the processing device is a stirring vessel, and the plate-like member is one or more selected from the group consisting of a baffle plate and a stirring blade.

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