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Immersed boundary force feedback method based on right body and fluid coupling effect prediction

A feedback force and rigid body technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the inability to calculate the force density of solids, and achieve the effect of ensuring energy conservation, wide application fields, and wide application

Inactive Publication Date: 2014-05-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For rigid bodies, since the deformation energy is zero, the solid force density cannot be calculated, and the traditional immersed boundary method is powerless to solve the coupling effect between rigid bodies and fluids.

Method used

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  • Immersed boundary force feedback method based on right body and fluid coupling effect prediction
  • Immersed boundary force feedback method based on right body and fluid coupling effect prediction
  • Immersed boundary force feedback method based on right body and fluid coupling effect prediction

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Embodiment 1

[0044] Embodiment 1: as Figure 1-2 Shown, a kind of immersion boundary feedback force method based on predicting the coupling effect of rigid body and fluid, the concrete steps of described method are as follows:

[0045] A. Call the grid division module and use two sets of grids: the flow field area and the rigid body area; the flow field area is discretized with a Cartesian grid under the Euler description, and the rigid body area uses a fit curve under the Lagrangian description. grid discrete;

[0046] B. Call the initial value calculation module to obtain the steady-state flow field in the flow field area as the initial value condition for the transient calculation of the flow field;

[0047] C. Call the immersed boundary method module to advance the entire physical system composed of rigid body and flow field in time, and set the following three sub-modules in the immersed boundary method module: flow field calculation module, information exchange module and feedback for...

Embodiment 2

[0077] Embodiment 2: as Figure 1-2 Shown, a kind of immersion boundary feedback force method based on predicting the coupling effect of rigid body and fluid, the concrete steps of described method are as follows:

[0078] A rigid cylinder is placed in the fluid, the specific calculation object is: first calculate the area length L =2.5 m wide H =0.41 m: take the lower left corner of the calculation area as the origin (0, 0), the center of the cylinder is (0.2 m, 0.2 m), and the radius of the rigid cylinder is 0.05 m.

[0079] S1: Meshing

[0080] The flow field area (including the fluid and rigid cylinder area) adopts Cartesian grid division under the Euler description, and the unit coordinate information is output to the file fnode.txt, and the rigid body area uses the fit curve grid under the Lagrangian description Division, the corresponding grid node information file is output to the snode.txt file: In the grid at the initial moment: the rigid body fit curve grid descr...

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Abstract

The invention relates to an immersed boundary force feedback method based on right body and fluid coupling effect prediction, and belongs to the technical field of the computational fluid mechanics and fluid-solid coupling simulation of the computational fluid mechanics. The method includes the steps that 1, grids are called for dividing modules, and two sets of grids including a fluid field region and a rigid body region are adopted; 2, an initial value calculation module is called to obtain initial value conditions calculated with a stable fluid field of the fluid field region serving as a fluid field transient state ; 3, an immersed boundary method module is called, a whole physical system composed of rigid bodies and fluid fields advances in time, and the following three sub-modules of the fluid field calculation module, the information exchange module and the feedback force calculation module are set in the immersed boundary method module; 4, a result output module is called, force exerted on the rigid bodies and fluid field information are output to a file to be read and displayed by a background; 5 whether calculation ends or not is judged. According to the method, the moving-grid technology is prevented from being used, and therefore a large number of calculation resources are saved; the defects that deformation energy of the rigid bodies is zero, and the acting force density of solid bodies cannot be calculated easily are overcome.

Description

technical field [0001] The invention relates to an immersed boundary feedback force method based on predicting the coupling effect of a rigid body and a fluid, and belongs to the technical field of computational fluid dynamics and fluid-solid coupling simulation. Background technique [0002] One of the difficulties in fluid-structure interaction problems is that fluids and solids use different mathematical description frameworks. Usually, the fluid motion is described by Euler, while the solid motion is described by Lagrangian: the traditional immersed boundary method often simplifies the solid as an elastic body, and its deformation energy (or solid force density) is easy to solve. For rigid bodies, since the deformation energy is zero, the force density of solids cannot be calculated, and the traditional immersed boundary method is powerless to solve the coupling effect between rigid bodies and fluids. For this reason, the present invention proposes the feedback force im...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王文全闫妍张立翔曾云杨洋李金海杨锡阶郭涛
Owner KUNMING UNIV OF SCI & TECH
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