Immersing boundary flow field calculation method based on fluid/solid interface consistency
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A calculation method and boundary flow technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as large error in velocity distribution near the boundary layer and extremely complicated interpolation process
Active Publication Date: 2014-08-06
KUNMING UNIV OF SCI & TECH
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Usually, the fluid motion is described by Euler, while the solid motion is described by Lagrangian: in the traditional immersed boundary method, the velocity of the solid boundary area is mostly obtained by linear (bilinear) interpolation, and the interpolation process is often extremely complicated, and the obtained boundary The velocity distribution error near the layer is large
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Embodiment 1
[0047] Example 1: as Figure 1-3 As shown, a method for calculating the immersion boundary flow field based on the consistent condition of the fluid-solid interface, the specific steps of the method are as follows:
[0048]A. Call the meshing module and use two sets of meshes: the flow field area and the solid boundary area; the flow field area is discretized by Cartesian grid under Euler description, and the solid boundary area is described by Lagrangian Volume curve mesh discretization;
[0049] B. Call the initial and boundary value setting module, set the boundary conditions of the flow field for the boundary of the flow field area, and set the initial value for the original variables of the flow field area;
[0050] C. Call the flow field velocity prediction module, and use the step-by-step projection method to solve the flow control equation of the incompressible viscous Newtonian fluid, and obtain the predicted value of the original variable in the flow field area;
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Embodiment 2
[0082] Example 2: as Figure 1-3 As shown, a method for calculating the immersion boundary flow field based on the consistent condition of the fluid-solid interface, the specific steps of the method are as follows:
[0083] The height of the square column in the solution area is H , the calculation area is , a rigid square column is immersed in the flow field, and the coordinate origin is located at the lower left vertex of the square column. The flow Reynolds number is defined as ,Time Step , the boundary of the square column is discrete with a spacing of 0.01 H .
[0084] S1: Meshing
[0085] The flow field area (including the fluid and rigid square column area) is divided by Cartesian grid under Euler description, the grid is a uniform quadrilateral grid, and the grid spacing is h =0.01 H , and output the cell coordinate information to the file fcor.txt, the solid boundary area is meshed with aptamer curves under the Lagrangian description, and the spacing is 0.0...
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Abstract
The invention relates to an immersing boundary flow field calculation method based on fluid / solid interface consistency and belongs to the technical field of computational fluid mechanics and liquid / solid coupling simulation. The method comprises the steps that A, a grid division module is called, and two grids including a flow field region and a solid boundary region are adopted; B, a flow field calculation model is called, and a predicted value of the flow field region is obtained; C, a solid boundary force density calculation model is called, and the density of force acting on a solid boundary is obtained; D, a flow field velocity correction module is called, a correction value of the flow field region is obtained, and the flow field velocity is updated; E, a result output module is called, the force acting on the solid boundary and flow field information are output to a file and are read and displayed on a backstage; F, whether calculation is ended is judged. According to the method, use of the dynamic mesh technique is avoided, and a large number of computing resources are saved; the defects that when a traditional immersing boundary method is used, an interpolation algorithm is complex in the velocity solving process in a near wall region, and the intensity of the acting force on the solid boundary can not be calculated easily are overcome.
Description
technical field [0001] The invention relates to an immersion boundary flow field calculation method based on the consistent condition of a fluid-solid interface, 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, and the solid motion is described by Lagrangian: the traditional immersion boundary method, the velocity of the solid boundary region is mostly obtained by linear (bilinear) interpolation, and the interpolation process is often very complicated, and the obtained boundary The velocity distribution near the layer has a large error. Therefore, the present invention proposes a calculation method of the immersion boundary flow field based on the consistent condition of the fluid-solid interface, which ...
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