Learning Forum

[klara.marek]

🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions

Hello!

I was wondering if it was possible to simulate natural convection in a cubical air-filled cavity using Discovery Explore Mode.

The model is depicted in the above picture and my setup attached in the file. There is a hot and and opposite cold wall, the ones separating the two are insulated. I’d be expecting a circulation to develop in the fluid but when I start the simulation, nothing happens. There is just a blue cube, no velocity or temperature profiles developing (sometimes I even get an error message reading “Unexpected Error” and I can either choose to save the file as a new version or end it without saving).

So I was wondering if it was possible to simulate natural convection in Discovery Explore Mode at all or if I have a mistake/ there is a better practice for a case like this in the model. Trying to simulate the case in the Refine Mode of the program did not pose the same difficulties. I know the material details are constant and only incompressible flows are realizable. However the driving force in natural convection are changes in density – can you help me understand, how this is calculated in Discovery?

Thank you very much for all comments, clarifications and inputs regarding this problem!

[Charudatta Bandgar]

Hello Klara

Let me look into this, and I will get back to you. If I remember correctly, this is a similar problem mentioned here?

Regards.

[klara.marek]

Hello Charudatta , yes exactly! However now I am using the latest release. Before, using the older release of Discovery, I could see results in Explore Mode but now it is not possible. Thank you for looking into this! 

[Charudatta Bandgar]

Hello Klara 

This sounds like a known bug (345021) found in 2020R2.5, which seems to be reappearing. Although the workaround that has been found helpful so far is to rerun it. But it looks like that is also not working for you. (Can you please try doing that again?). 

If I remember correctly, the same file had no such issue solving earlier, so I do not think this is a problem with your setup. I will test it on my end and see if even I face the same issue, if yes, I will get in touch with the developers and see what can be done.

Regards.

[klara.marek]

Hello Charudatta Bandgar 

Yes indeed, rerunning and redoing the setup both did not help. Right now I am using Release 2021 R1.2

Thank you for looking into this

[Charudatta Bandgar]

Hello Klara 

I ran the file you shared (without any changes) and it worked without any issue. It could be possible that this was a bug in 2021R1.2 which is resolved in the new version 2021R1.6. Can you please install it and see if it works?

 

Regards.

[klara.marek]

Hello Charudatta Bandgar 

I am sorry for my late reply! Thank you for looking into this - with the update I don't face this problem anymore. 

[Charudatta Bandgar]

Thanks for the update, Klara