Technique to Calculate Cell Face Velocity of a Non-Staggered Grid System
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摘要: 讨论了同位网格下,离散的连续性方程、动量方程及标量方程中控制容积界面上速度的计算方法.分别采用动量插值技术和线性插值技术计算了动量方程和标量方程的离散系数中的界面速度,并将两种方法得到的计算结果进行了比较.指出当采用线性插值技术去计算离散方程系数中的界面速度时,离散系数中的质量残余必须等于0,这样才能保证数值解的准确性和计算的收敛速度.Abstract: The calculation of cell face velocity in the discretization of continuity equation, momentum equation and scalar equation of a non-staggered grid system were discussed. Both momentum interpolation and linear interpolation were adopted to evaluate the coefficients in the discretized momentum and scalar equation, and their performances were compared. When linear interpolation was used to calculate coefficients, the mass residual term in the coefficients must be dropped to maintain the solution accuracy and its convergence rate.
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Key words:
- collocated grid /
- staggered grid /
- momentum interpolation
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