既然k-omega 和k-epsilon 各有所长,那就把它们结合起来吧,于是一个更加适用的湍流模型就诞生了。1992年,NASA Ames 研究中心的Menter 博士提出了著名的k-omega SST 湍流模型,在omega 方程后面添加了一个交叉扩散项,这个交叉扩散项刚好就是k-omega 和k-epsilon 模型之间的差...
Hi I was reading in ANSYS help documentations that K-Omega is insensitive to Y+ calculations but that makes me ask how do you assess whether the near wall mesh is refined enough ? Is Y+ or Y* between 2 and 4.5 acceptable? Knowing that the viscous layer is between 0 to 5. Another ...
[摘要]基于k-omegaSST模型、结合多相流模型及流体体积自由水面捕捉技术对含收缩段 的明渠流进行了三维数值模拟。模拟所得的不同位置处的流速纵向分布曲线与实验数据基本 吻合,验证了该模型在含收缩段明渠流预测中的适用性。此外,利用该方法对流场的自由水面 ...
9.本文描述的是用于omega偏微分方程的一般性壁边界条件处理,以用于用特别使用sst k ‑ omega湍流模型的模拟来指定边界条件,并且更一般地,该解一般适用于k ‑ omega 湍流模型公式。 10.本文描述的一般性壁边界条件自动地施加粘性底层(viscous ‑ sublayer)和对数层(logarithmic layer)中所需的正确的辅助渐近关系...
流体的分离量。SST 模型的最大优点在于考虑了湍流剪切应力,从而不会对涡流粘度造成过度预测。SST 模型的湍动能方程也为式(1),其比耗散率输运方程为: ρ i i j j u D T G Y D D t x x x(3) 式中, 代表正交发散项,其余各参数与标准k-Omega 模型中的参数含义相同。
I am simulating multiphase problem of cavitation with k-omega SST turbulence model and I am trying to make UDF to reduce the turbulent visocosity, especially in areas with low void ratios. I have already done it for k-epsilon RNG model (and it worked well) according to: ...
1.18D 误差(%) 0.415 28.87 30.05 表2 vb的对比情况 Table 2 Contrast result of the parameter vb 实验结果 文献 LES SST k-Omega vb -0.254 -0.245 -0.247 -0.117 -0.228 误差(%) 2.76 53.93 10.24 图4是圆柱后近尾流区(x / D=1.06)u沿y方向的u达到负向最大值,并向圆柱两侧逐渐增大,最后趋于稳定...
所以就选了最常用的模型来计算。可是老板说目前比较流行的模型是k-omega SST。
October 18, 2006, 13:19 K omega #1 efb Guest Posts: n/a I have done steady simulation on airfoil at low reynolds number (800000) with K-omega SST transitional and yplus less than 1.0 and the result is little far from experimental (even the angle of attack is less than stall angle)...
I have even seen performing realizable k-epsilon with low y+ treatment model performing better than SST in certain transient flows involving strong flow separation. To me it seems that is not right to say that SST is better than k-epsilon. ...