Learning Forum

[arunhsc]

I am trying to set the 'Reference Values' to compute the velocity from the inlet zone. When I select it and run my calculations it works for the current set up.

If I close Fluent and open it back again this setting goes back to the default of 'Blank'. 

Any idea how to save this settings so that I can change my velocity as a Design Point parameter from Workbench and use the right values of the 'Reference Values' of inlet velocity for the corresponding design point.

[Amine Ben Hadj Ali]

Are you opening from setup cell? If not then please do that and save settings.

[arunhsc]

Thank you for your reply abenhadj

I am not sure what you mean. But I am accessing the settings as shown.

The issue is not that my zones are missing, its just that the option i select (in this case my inlet) is not retained for further sessions.

[Amine Ben Hadj Ali]

In the workbench you need to open Fluent from setup cell. If still am issue let us know

[Amine Ben Hadj Ali]

In the workbench you need to open Fluent from setup cell. If still am issue let us know

[arunhsc]

I am opening Fluent from workbench thus:

 

Once I have made the 'Reference Value > Compute from' changes I save the project as show:

But when I open the set up again that particular setting is back to default.

The interesting thing is the rest of the changes I make are retained when I follow the above process. This is also true for 'Reference Value > Reference Zone' option at the bottom of the 'Reference Value' page.

[Amine Ben Hadj Ali]

Workaround will by using automatic case modification or startup scheme.
Which version are u using,?

[arunhsc]

I am using Ansys 2019 R3: Academic.

[Amine Ben Hadj Ali]

Then stick to the workaround suggested first.

[arunhsc]

Amine, Thank you very much for your time and help.

I am a very basic user of Fluent/Workbench. However I shall look up for those topics.

 

[Rob]

The other question is why you need the reference values: they don't do anything in the solver and are only used for some post processing. 

[arunhsc]

The idea is to be able to automate the calculation of drag coefficient for a set of design velocities as shown:

I could have used the drag force to calculate the coefficients, but I was trying to automate everything so that I can run the same experiment on all my geometries overnight. 

[Amine Ben Hadj Ali]

Better to write a user defined report definition with output parameter or use Report definition expression option

[lordofthethings]

Hi Arun,nDid you find a workaround for this? This is a crucial point when parameterising the simulation. Even in my case the reference values are going to blank because of which the post processed values are not correct (in my case, the Nusselt number and heat transfer coefficient.)nCould you please share with me the workaround if possible?nRegards,nParitoshn

[Karthik Remella]

Hello lordofthethings, We are responding to you here.
Karthik