- **CFX**
(*http://www.cfd-online.com/Forums/cfx/*)

- - **velocity gradient issue in cfx**
(*http://www.cfd-online.com/Forums/cfx/69712-velocity-gradient-issue-cfx.html*)

velocity gradient issue in cfxHI,
I'm trying to study shear rate in a simulation by generating the velocity gradient value in cfx. This value should have a dimension of inverse second. However, when I plot the magnitude of velocity gradient , I didn't find any unit there. So what's the definition of the variable "velocity gradient " in cfx? Another question is about a variable， taking "velocity u. gradient" as an example, is it defined this way please? velocity u. gradient=sqrt[(partial u/partial x)^2+(partial u/partial y)^2+(partial u/partial z)^2]? Thanks a lot for your help in advance~! |

Hi
Did you find out about the definition of Velocity u.Gradient x in cfx? I almost have the same problem. There is one more thing, how can I define (partial u)/(partial x) in CEL expressions? do you have any idea? |

But the variable velocity u.gradient does have units of s^-1, as expected.
And yes, velocity u.gradient=sqrt(velocity u.gradient X^2+velocity u.gradient Y^2+velocity u.gradient Z^2). Ali's question is quite different. Read the documentation about getting spatial derivatives of variables. There is built in functions to calculate this in CEL. |

I found it in documentations
Thank you ghorrock |

All times are GMT -4. The time now is 09:35. |