Hello,

I'm looking for a sample of UDF or want to know the variables to make UDF for Turbomachinery.

What I want to do is to change RPM of fluid by time dependent.

FLUENT do not have choice to change RPM time dependent or using UDF for sliding mesh.

Please help me!

Regards,

U can do by a script. What do you want with UDF? Check the UDF manual. Yes you can change the rpm by a script for a time dependent prob.

U mean using profile file as script, right? I just want to make UDF for rotational machine from 0 RPM to accerelated certain RPM.

U se moving wall BC. In the script you can use one RPM for certail time and then you can use a different RPM and you can do this as long as want and as many RPM you wants.

Do you mean you want to use a time variation of the rotating wall? I mean rpm = f ( time)? Yes for this u need UDF.

Otherwise use a simple script and submit the job as a batch.

For example: file rcd tom q def bc wall ... ... ... [make here ur desired rpm]

q q .. [then solve for certain time steps.. .. then q q def bc wall. ..[change ur rpm as u want..]

... ...

Regards, phd_y2k2001@yahoo.com

[Manjunath_CB]

I'm working on a centrifugal pump. I want to run transient (using sliding mesh method) simulation in fluent with imposing varying speed of impeller.
Please provide me, if u have, UDF for imposing variable speed on a rotating fluid zone.
Thank you!

Manjunath