[Saleeman1234]

Hello

I have a question

if I have an expression like

CEL1= 1/(Variable1+Variable2)
and run time 10 seconds

If I want to make a chart of these 2 (CEL1 across run time), is it possible? if Possible then how??
Please give me a hint or some procedure document,

thank you so much

[ghorrocks]

Make a monitor point equal to your expression, then you can have a look at it versus iteration, time step, time, or anything else in the solver manager.

[Saleeman1234]

Thank you so much Ghorrocks

I have tried my expression which contains pabs and Temperature, but it gives error because of Pressure (pabs). Please tell me what would be the possibility of this error and what should I do now?

Thank you so much once again.

[ghorrocks]

Posting the error message would help.........

[Saleeman1234]

Hello Ghorrocks

Here is the error massege which I recieved.
"
The parameter 'Expression Value' is defined to be Single Valued but it depends on the field variable: pabs
Error processing expression: Expression Value = Xbeladung"

Xbeladung is name of my CEL

Thank you so much

[ghorrocks]

Please post your CCL or output file.

[Saleeman1234]

Hello

My CEL for Xbeladung is as follows

(1/((pabs*1[kg^-1 m s^2])/((0.72638+(-0.00562)*Water.Temperature*(1[K^-1])+0.00001357*Water.Temperature^2*(1[K^-2])))^(3.43213)))

Is it possible that if I mention in CFX pre and get that chart in CFX post

[ghorrocks]

This expression will return a field variable as both pabs and Water.Temperature are field variables. So if you are using it to set a single value parameter then I would expect you would get the error you report.

Please post your CCL or output file. Or if you are not getting this error in the solver tell us where you are getting the error message.

[Opaque]

There is some confusion here. What are you trying to monitor ? The expression everywhere, or a given set of points ? For the former, you can try creating an user defined variable, and visualizing in CFD-Post, or in the solver during the run (see below)

Monitoring functionality only provide a single value to be displayed in the solver manager via expression monitoring, or monitor point selection

Expression monitoring is only valid for single valued expressions, i.e. expression that produces a single value such as massflow at an inlet, average pressure at outlet, or combination of similar values.

Monitor points basically probe a field (which may be an expression by using an algebraic additional variable), and display the probe valued in the solver manager. You can try this route if you know where in the domain the value has some significance.

[Saleeman1234]

Hello

My CEL for Xbeladung is as follows

(1/((pabs*1[kg^-1 m s^2])/((0.72638+(-0.00562)*Water.Temperature*(1[K^-1])+0.00001357*Water.Temperature^2*(1[K^-2])))^(3.43213)))

Actually I need the Expression mentioned above in a graphical manner like monitor points or Chart viewer. I want to see this Expression with run time.

Thanks for ur time and favor

[ghorrocks]

Have you read opaque's post? He explains what is happening.

Your monitor point needs to return a single value at each iteration. Your expression returns a variable field. You need to change your expression to return a single value. You probably want to use some averaging or point functions to return a single value of pabs and temperature.

[Saleeman1234]

Thank You Ghorrocks and Opaque

I will try and then ask if I found some problem.