A simplified method for simulating a condenser or radiator for a whole vehicle wading

Abstract

The present invention belongs to the technical field of automobile simulation, and specifically relates to a method for simplifying a condenser or radiator for a whole vehicle wading simulation; a simplified model is established using a radiator / condenser geometric model; the geometric projected area and core thickness of the radiator / condenser are extracted; a liquid phase apparent velocity is generated; a liquid phase pressure gradient is generated; a structured grid is created; a curve is fitted using the liquid phase apparent velocity and pressure gradient; the liquid phase viscous drag coefficient and inertial drag coefficient are extracted and assigned to the radiator / condenser structured grid; the present invention concisely and efficiently simulates the pressure drop on the outside of the condenser / radiator in the whole vehicle wading simulation, thereby improving the efficiency and accuracy of the analysis and shortening the research and development cycle.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile simulation, and in particular relates to a method for simplifying a whole vehicle wading simulation condenser or radiator. Background Art

[0002] As cities grow, the number of bridges, culverts, and tunnels increases. Road flooding becomes a common occurrence during rainstorms, and vehicles often experience wading through water. Existing standards clearly define the test methods and requirements for electric vehicles undergoing wading. However, verifying wading performance through testing during the vehicle development phase is time-consuming and costly. Therefore, simulation analysis is necessary to provide a valuable foundation for vehicle development.

[0003] Currently, the technology for whole-vehicle water wading simulation analysis is in its early stages of development. During whole-vehicle water wading simulation, water pressure drops after flowing through the condenser / radiator at varying speeds due to the resistance of the condenser / radiator fins. Traditional condenser / radiator analysis methods require detailed modeling of the condenser / radiator fins to simulate these operating conditions in order to accurately calculate the water pressure after passing through them. However, due to the small size and large number of condenser / radiator fins, detailed modeling and computational complexity are prohibitive for whole-vehicle water wading simulation analysis. Summary of the Invention

[0004] In order to overcome the above problems, the present invention provides a simplified method for a whole vehicle water wading simulation condenser or radiator, aiming to use a simple and efficient method to simulate the pressure drop on the outside of the condenser / radiator in the whole vehicle water wading simulation, so as to improve the efficiency and accuracy of the analysis and shorten the research and development cycle.

[0005] A simplified method for simulating a condenser or radiator of a vehicle fording water includes the following steps:

[0006] Step 1: Using the 3D geometric data of the radiator or condenser, create a simplified model of the radiator or condenser in 3D modeling software, ensuring that the simplified model can enclose the fin area of ​​the radiator or condenser;

[0007] Step 2: Measure the normal projection area S and normal core thickness L on the simplified model of the radiator or condenser;

[0008] Step 3: Calculate the apparent velocity array V of the radiator or condenser liquid phase according to the following formula: water :

[0009] V eater =Q water / S

[0010] where Q water is the liquid phase flow array Q water ;

[0011] Step 4: Calculate the radiator or condenser liquid phase pressure gradient array according to the following formula

[0012]

[0013] where ΔP water is the liquid phase pressure drop array ΔP water ;

[0014] Step 5: Create a structured mesh in StarCCM+ using the simplified radiator or condenser model.

[0015] Step 6: Use the radiator or condenser liquid phase apparent velocity array V obtained in step 3 water The Y-axis is the array of the radiator or condenser liquid phase pressure gradient obtained in step 4. The X-axis is the fitting curve of the pressure gradient and superficial velocity of the liquid phase;

[0016] Step 7: Extract the liquid phase viscous drag coefficient and inertial drag coefficient using the fitting curve of the liquid phase pressure gradient and the apparent velocity;

[0017] Step 8: The liquid phase viscous resistance coefficient a water and liquid phase inertial drag coefficient b water Assign a structured mesh to the radiator or condenser for water simulation calculations.

[0018] In the step 1, the simplified model only retains the information of the fins and the clamping plates in the three-dimensional geometric data of the radiator or condenser, and the length, width and height of the simplified model are consistent with the fins and the clamping plates.

[0019] The normal projection area S in step 2 is the product of the width W and the height H of the simplified model of the radiator or condenser.

[0020] The structured grid created in step 5 has a height dimension of H / 100 mm, a width dimension of W / 100 mm, and a thickness dimension of L / 6 mm.

[0021] The curve fitting method in step 6 is the least squares method, and the order of the fitting curve is 2nd order.

[0022] The fitting curve of the pressure gradient and superficial velocity of the liquid phase in step 7 is given by the formula: y = a water x 2 +b water X represents a water is the liquid phase viscous resistance coefficient, b water is the liquid phase inertial drag coefficient; where y is the radiator or condenser liquid phase apparent velocity array V water , x is the array of liquid pressure gradient of radiator or condenser

[0023] Beneficial effects of the present invention:

[0024] The present invention simplifies the complex radiator or condenser fin resistance into a cubic area, and uses the condenser / radiator fin water resistance pressure difference fitting curve under different water speeds to simulate the pressure drop on the outside of the condenser / radiator during the vehicle wading process, thereby providing support for high-precision and high-efficiency vehicle wading simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 The three-dimensional geometric data of the condenser or radiator;

[0027] Figure 2 It is a simplified model diagram of a condenser or radiator;

[0028] Figure 3 Schematic diagram of structured grid for radiator or condenser;

[0029] Figure 4 is the fitting curve of the liquid phase pressure gradient and superficial velocity. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0031] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] Example 1

[0035] A simplified method for simulating a condenser or radiator of a vehicle fording water includes the following steps:

[0036] Step 1: Using the 3D geometric data of the radiator or condenser, create a simplified model of the radiator or condenser in 3D modeling software, ensuring that the simplified model can enclose the fin area of ​​the radiator or condenser;

[0037] Step 2: Measure the normal projection area S and normal core thickness L on the simplified model of the radiator or condenser;

[0038] Step 3: Calculate the apparent velocity array V of the radiator or condenser liquid phase according to the following formula: water :

[0039] V water =Q water / S

[0040] where Q water is the liquid phase flow array Q water ; is the test value, which is the control variable of the test. It is measured by referring to the patent number 202220765611.5, and the patent name is a patented device for testing the water resistance pressure difference on the outside of a car condenser / radiator. It is the flow rate of water passing through the cylinder at different water speeds.

[0041] Step 4: Calculate the radiator or condenser liquid phase pressure gradient array according to the following formula

[0042]

[0043] where ΔP water is the liquid phase pressure drop array ΔP water ; is the test value, which is the result of the test. It is measured by referring to the patent number 202220765611.5, and the patent name is a patented device for testing the water resistance pressure difference on the outside of an automobile condenser / radiator. It is the pressure difference on both sides of the vane under different water speeds.

[0044] Step 5: Create a structured mesh in StarCCM+ using the simplified radiator or condenser model.

[0045] Step 6: Use the radiator or condenser liquid phase apparent velocity array V obtained in step 3 water The Y-axis is the array of the radiator or condenser liquid phase pressure gradient obtained in step 4. The X-axis is the fitting curve of the pressure gradient and superficial velocity of the liquid phase;

[0046] Step 7: Extract the liquid phase viscous drag coefficient and inertial drag coefficient using the fitting curve of the liquid phase pressure gradient and the apparent velocity;

[0047] Step 8: The liquid phase viscous resistance coefficient a water and liquid phase inertial drag coefficient b water Assign a structured mesh to the radiator or condenser for water simulation calculations.

[0048] In the step 1, the simplified model only retains the information of the fins and the clamping plates in the three-dimensional geometric data of the radiator or condenser, and the length, width and height of the simplified model are consistent with the fins and the clamping plates.

[0049] The normal projection area S in step 2 is the product of the width W and the height H of the simplified model of the radiator or condenser.

[0050] The structured grid created in step 5 has a height dimension of H / 100 mm, a width dimension of W / 100 mm, and a thickness dimension of L / 6 mm.

[0051] The curve fitting method in step 6 is the least squares method, and the order of the fitting curve is 2nd order.

[0052] The fitting curve of the pressure gradient and superficial velocity of the liquid phase in step 7 is given by the formula: y = a water x 2 +b water X represents a water is the liquid phase viscous resistance coefficient, b water is the liquid phase inertial drag coefficient; where y is the radiator or condenser liquid phase apparent velocity array V water, x is the array of liquid pressure gradient of radiator or condenser

[0053] Example 2

[0054] 1. A simplified method for a vehicle wading simulation condenser radiator, comprising the following steps:

[0055] 1) Using the 3D geometry data of the radiator or condenser, such as Figure 1 As shown in the figure, create a simplified model of the radiator or condenser in the 3D modeling software. Ensure that the simplified model can envelop the radiator or condenser fin area, such as Figure 2 shown.

[0056] 2) Measure the normal projection area S and normal core thickness L on the simplified model of the radiator or condenser, such as Figure 2 shown.

[0057] 3) Using the liquid flow array Q water Processed with the normal projection area S obtained in step 2, the radiator or condenser liquid phase apparent velocity array V is obtained water .

[0058] 4) Using the liquid phase pressure drop array ΔP water Processed with the normal core thickness L obtained in step 2; the radiator or condenser liquid phase pressure gradient array is obtained

[0059] 5) Use the simplified model of the radiator or condenser obtained in step 2 to create a structured grid of a specific size in StarCCM+, such as Figure 3 shown.

[0060] 6) Use the radiator or condenser liquid phase apparent velocity array V in step 3 water And the radiator or condenser liquid phase pressure gradient array obtained in step 4 Fitting curve of pressure gradient and superficial velocity of the liquid phase.

[0061] 7) Using the fitting curve of the liquid phase pressure gradient and apparent velocity in step 6, the liquid phase viscous drag coefficient and inertial drag coefficient are extracted.

[0062] 8) After the liquid phase viscous drag coefficient and inertial drag coefficient are assigned to the radiator or condenser structured grid, they can be used for water simulation calculations.

[0063] In step 1), the three-dimensional geometric data used should include detailed information of the fins and clamping plates of the radiator or condenser, and the length, width and height of the simplified model should be consistent with the fins and clamping plates.

[0064] In step 2), the normal projection area S is the product of the width W and the height H of the simplified model of the radiator or condenser.

[0065] In step 3), the radiator or condenser liquid phase apparent velocity array V water =Q water / S.

[0066] In step 4), the radiator or condenser liquid phase pressure drop array

[0067] In the step 5), the grid type of the radiator or condenser is a structured grid, the grid height dimension is H / 100 mm, the width dimension is W / 100 mm, and the thickness dimension is L / 6 mm.

[0068] In step 6), the X-axis of the fitting curve of the pressure gradient and superficial velocity of the liquid phase is the radiator or condenser pressure drop array. The Y axis is the apparent velocity array V of the radiator or condenser water The curve fitting method is the least square method, and the order of the fitting curve is 2nd order, such as Figure 4 shown.

[0069] In step 7), the fitting curve of the pressure gradient and superficial velocity of the liquid phase is given by formula 1: y = a water x 2 +b water X represents a water is the liquid phase viscous resistance coefficient, b water is the liquid phase inertial drag coefficient.

[0070] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all fall within the scope of protection of the present invention.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0072] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A simplified method for wading simulation condenser or radiator of a whole vehicle, characterized in that The following steps are included: Step 1: Using the 3D geometric data of the radiator or condenser, create a simplified model of the radiator or condenser in 3D modeling software, ensuring that the simplified model can enclose the fin area of ​​the radiator or condenser; Step 2: Measure the normal projection area S and normal core thickness L on the simplified model of the radiator or condenser; Step 3: Calculate the apparent velocity array of the radiator or condenser liquid phase according to the following formula : in is the liquid phase flow array; Step 4: Calculate the radiator or condenser liquid phase pressure gradient array according to the following formula : in is the liquid phase pressure drop array; Step 5: Create a structured mesh in StarCCM+ using the simplified radiator or condenser model. Step 6: Use the radiator or condenser liquid phase apparent velocity array obtained in step 3 The Y-axis is the array of the radiator or condenser liquid phase pressure gradient obtained in step 4. The X-axis is the fitting curve of the pressure gradient and superficial velocity of the liquid phase; Step 7: Extract the liquid phase viscous drag coefficient and inertial drag coefficient using the fitting curve of the liquid phase pressure gradient and the apparent velocity; Step 8: Liquid phase viscous resistance coefficient and liquid phase inertial drag coefficient Assign a structured mesh to the radiator or condenser for water simulation calculations.

2. A simplified method for a vehicle wading simulation condenser or radiator according to claim 1, characterized in that In the step 1, the simplified model only retains the information of the fins and the clamping plates in the three-dimensional geometric data of the radiator or condenser, and the length, width and height of the simplified model are consistent with the fins and the clamping plates.

3. The simplified method for a vehicle wading simulation condenser or radiator according to claim 1, characterized in that The normal projection area S in step 2 is the product of the width W and the height H of the simplified model of the radiator or condenser.

4. A simplified method for a vehicle wading simulation condenser or radiator according to claim 3, characterized in that The height size of the structured grid created in step 5 is mm, width dimension is mm, thickness dimension is mm.

5. The simplified method for a vehicle wading simulation condenser or radiator according to claim 1, characterized in that The curve fitting method in step 6 is the least squares method, and the order of the fitting curve is 2nd order.

6. The simplified method for a vehicle wading simulation condenser or radiator according to claim 1, characterized in that The fitting curve of the pressure gradient and superficial velocity of the liquid phase in step 7 is given by the formula: + x express, is the liquid phase viscous resistance coefficient, is the liquid phase inertial drag coefficient; y Array of superficial velocity of the radiator or condenser liquid phase , x Array of liquid pressure gradients for the radiator or condenser .

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