[mejahan]

Dear friends,

I have used time dependent inlet velocity for BC with fixed pressure outlet, now I need to find and expression for the inlet pressure in respect to the time in CFX Post.

I would appreciate if any CFX experts can help me .

Thanks

Mehdi

[ghorrocks]

Define a monitor point with the CEL expression areaAve(p)@inlet, then rerun the simulation and you will have the result in the solver manager.

[mejahan]

Thanks Glen,

You mean that there is no way in the CFX post to have the expression for variables in respect to the time , if I do not set the CEL in the CFX pre?

Thanks

Mehdi

[ghorrocks]

You certainly can - the variable is simply "t".

[mejahan]

Can you please tell me the expression ,
Suppose that I want area or mass average of pressure at the inlet in respect to the time,

Thanks

Mehdi

[Antanas]

Do you mean that you want to know how pressure was changing during solution process? I think that it's impossible if your simulation is steady state because only final results are stored. As Glenn mentioned you may create monitor to obtain pressure history.

[mejahan]

My solution is transient and I need to find an expression in respect to the time for variables,
I know how to have area or mass average of variables in inlet or other sections in different time steps , but by this method I have to choose the time step and then everything are updated. By this method I have to enter the data for every time step into an Excel sheet , then extract the expression.
But as Glen said , I guess that there should be an easier way in CFX post to do this.
I appreciate if you let me know how to do it.

Thanks

Mehdi

[Lance]

Try:

expression: areaAve(Pressure)@inlet
then create a chart, transient, and chose your expression
apply

That would give you a graph of the area average pressure at 'inlet' over time

[mejahan]

Thanks Lance.

It worked for me.