ansys里面怎么计算wall的摩擦损失？怎样计算disspation？

qcrh

我是学电机的，想计算通风冷却时候wall 的roughness造成的摩擦损失，
求教各位大侠！
You can also apply an empirical dimensionless factor (CKS) between 0.5 and 1.0 that specifies the degree of nonuniformity of the surface. The default value of 0.5 means that the roughness signified by KS is uniformly distributed. Higher values increase the roughness losses without changing the flow regime implied by the value of KS. You can use the FLDATA24,TURB,CKS,Value command to specify this factor.
Higher values increase the roughness losses.如果我想知道wall的roughness造成的损失，怎么计算。fluid141的output里面也没有这个选项啊？
还有就是.rsw文件里面也没有这个选项啊！
Turbulence dissipation rate是个什么概念？
是不四涡流都有disspation，
如果采用平面轴对称模型，
最后怎么计算这个disspation？