How to do Time step averaging and measure frequenc
 

Hi,

1) How to do averaging of velocity/pressure for a few last time steps in LES?

2) Is there any direct feature provided in CFX to measure the frequency of solution obtained?

Thank you all, Peter

Re: How to do Time step averaging and measure freq
 

1) How to do averaging of velocity/pressure for a few last time steps in LES?- Hi Peter, you can set Trans Stats in CFx-Pre under solver control dialog box. you can set the iteration range for averaging your required variables. Once the simulation is stopped you will get those variables as TrnAvg in Cfx-post.

Re: How to do Time step averaging and measure freq
 

Thank you very much Farid.

It sounds great and I shall implement it in my next simulation.

By the way, can I do time step averaging of my finished simulation if I have not defined Trans Stats in CFX-Pre ? That way I can do it for the results which I already have.

and any idea how to measure frequency which people talk about?

Cheers, Peter

Re: How to do Time step averaging and measure freq
 

Hi,

For frequency, generate a monitor point which has the parameter you wish to do a frequency study on. In solver manager make a plot showing this monitor point versus time, export it and import into another software package which can calculate frequency - Excel, matlab, whatever.

Glenn Horrocks