Accelerating method for two-dimensional limited control volume calculation
A volume calculation and control volume technology, applied in calculation, design optimization/simulation, special data processing applications, etc., can solve problems such as low efficiency, and achieve the effect of improved operating efficiency, simple method, and good stability
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[0047] An acceleration method for two-dimensional finite control volume calculation, the steps are as follows:
[0048] Step 1: Optimize grid settings
[0049] Try to use triangular grids as little as possible, according to the calculation formula of Δt when CFL is close to 1:
[0050] When the unit is triangular,
[0051] When the unit is a quadrilateral,
[0052] Among them, Δr is the radius of the inscribed circle of the triangle; ΔX and ΔY are the side lengths of the quadrilateral respectively. Obviously, the time step of the quadrilateral of the same area is almost 1 times the time step of the triangle;
[0053] Step 2: Double time step advancement method
[0054] In the field of aerodynamics, an unsteady flow field calculation method called "dual time advance method" has been developed. That is, when solving the non-constant equations, the two-step method of physical time and virtual time is adopted. The selection of the physical time step depends on the accuracy requirements....
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