Riemann solver and artificial viscosity in sph 解與人工粘性
Based on finite difference technique , a new numerical simulation program on hemispherical gas cloud was worked out by homogeneous energy addition method and artificial viscosity , with which deflagration parameters were computed 利用能量均勻加入法和有限差分技術(shù),編制了半球形氣云爆炸過程的計(jì)算程序。
Three spatially discrete schemes about the convection terms of the n - s equations : the centered difference with artificial viscosity by jameson , the van leer scheme of flux vector splitting , and the roe scheme of flux difference splitting are studied respectively 3研究了n - s方程組中對流項(xiàng)的三種空間離散格式:改進(jìn)的jameson中心+人工粘性格式、通量矢量分裂類vanleer格式和通量微分分裂類roe格式。
2d viscous grids are generated by solving the elliptic grid generation together with an algebraic method marching along the normal - to - wall direction . the 2d euler program based on jameson ' s central finite volume method is upgraded with modified artificial viscosity and time stepping schemes , etc . euler program become n - s program by adding b - l model 對基于中心有限體積法的二維euler流場解算程序進(jìn)行了人工粘性和時(shí)間推進(jìn)格式等方面的改進(jìn),并添加b - l模型,使之成為二維n - s流場解算程序。