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Novel velocity correction method for projected immersed boundary method

A correction method and boundary technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of extremely complex calculation, large computational workload, and low computational efficiency.

Active Publication Date: 2015-08-26
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention provides a new velocity correction method of the projected immersed boundary method, which is used to overcome the problems of extremely complicated calculation, heavy computational workload and low computational efficiency in the traditional immersed boundary method in the near-wall velocity solution method, and avoids the problems of The complex interpolation process when solving the velocity in the near wall area greatly reduces the calculation workload and improves the calculation efficiency

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  • Novel velocity correction method for projected immersed boundary method
  • Novel velocity correction method for projected immersed boundary method
  • Novel velocity correction method for projected immersed boundary method

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Embodiment 1

[0056] Embodiment 1: as Figure 1-5 As shown, a new speed correction method of projected immersion boundary method, the specific steps of the method are as follows:

[0057] A. Invoke the mesh division module, using two sets of grids: flow field area and solid boundary area; the flow field area is discretized with Cartesian grid under the Euler description, and the solid boundary area is discretized under the Lagrangian description. The volume curve grid is discretized, and the flow field area includes the pure flow field area and the secondary flow field area;

[0058] B. 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;

[0059] C. Call the Euler grid point attribute judgment module to judge whether the Euler grid point belongs to the solid internal area or the solid externa...

Embodiment 2

[0100] Embodiment 2: as Figure 1-5 As shown, a new speed correction method of projected immersion boundary method, the specific steps of the method are as follows:

[0101] The flow field area includes a turbine movable guide vane airfoil, the length of its chord line is L, the maximum thickness is D, the calculation area is 15L×10L, and the coordinate origin is located at the midpoint of the chord line. The flow Reynolds number is defined as Re=ρU b D / μ=200, the time step Δt=0.002, and the discretization interval of the square column boundary is 0.01L.

[0102] S1: Meshing

[0103] The flow field area (including the fluid and turbine movable guide vane airfoil area) is divided into Cartesian grids under the Euler description. The grids are uniform quadrilateral grids, and the grid spacing is h=0.01L. And the flow field area is divided into a pure flow field area and a secondary flow field area. In this example, the secondary flow field area is 1.4L×1.4L, and the center of...

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Abstract

The present invention relates to a novel velocity correction method for a projected immersed boundary method, belonging to the technical fields of computational fluid dynamics and fluid-solid coupling simulation thereof. The velocity correction method of the present invention comprises: A) invoking a mesh generation module, wherein two meshes are used: an Eulerian mesh in a fluid field region, and a Lagrangian mesh in a solid boundary region; B) invoking a flow field velocity prediction module to obtain a predicted value of the flow field region; C) invoking an Eulerian mesh point attribute determining module to determine whether an Eulerian mesh point belongs to a solid inner region or a solid outer region; D) invoking a flow field velocity correction module to update a flow field velocity; E) invoking a result output module to output a force acting on a fluid-solid boundary and flow field information to a file, so that reading and displaying can be performed by the background; and F) determining whether to end calculation. The novel velocity correction method for the projected immersed boundary method eliminates the complex interpolation operation for resolving the velocity of the near-wall region in the conventional projected immersed boundary method, thereby saving computing resources and improving computing efficiency.

Description

technical field [0001] The invention relates to a novel velocity correction method of a projection immersion boundary method, and belongs to the technical field of computational fluid dynamics and fluid-solid coupling simulation thereof. 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: in the traditional immersed boundary method, the correction of the flow field velocity in the solid boundary area is mostly obtained by linear (bilinear) interpolation, and the calculation of the interpolation process is often extremely complicated , the calculation workload is large and the calculation efficiency is low. For this reason, the present invention proposes a new velocity correction method of the projected immersion boundary method, which divides the flow field a...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王文全闫妍
Owner KUNMING UNIV OF SCI & TECH
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