非结构网格限制器研究

研究了6种限制器形式及其参数计算方法,其中新的自适应VenkatakrishnanM限制器能够根据当地流场特征自动调节参数从而实现不同区域不同特性.数值试验表明:非结构网格限制器对邻居集合选择方法较敏感,其中共面法比共点法精度高约15%;高马赫数时压缩型限制器比耗散型限制器计算精度高约10%~40%;参变量算法中,方向梯度法得到的流场比增量法平滑;自适应VenkatakrishnanM限制器能够模拟复杂超声速流动.

Research on limiters of unstructured grid

Six limiters and methods of their parameters were researched, of which the adaptive VenkatakrishnanM limiter was able to balance the compression and dissipation of limiter by changing parameters adaptively. Numerical computations show that, limiters of unstructured grid are susceptible to neighbor set methods, and the common-face method has about 15% higher precision than the common-node one; under conditions of high Mach number, the compressive limiters have about 10%-40% higher precision than the dissipative ones; flow fields computed with the direction gradient method are more smooth than the augment method; the adaptive VenkatakrishnanM limiter is able to simulate complex supersonic flows.