Error while using 'free stream' in region settings

Kotabhi · August 21, 2019, 16:03

Hello,

I am new to this software and I am conducting velocity flow investigations on a bike surface.

When I changed the region type of the control volume block walls into ' free stream' and initialize the solution, I receive an an error saying that it is incompatible. The error vanishes when I change their type to wall. I don't not understand this issue.

I would be grateful if someone would explain this to me and let me know how if I want to continue with the ' free stream' setting.

Thank you.

fluid23 · August 22, 2019, 10:44

Do you by chance have constant density model selected? I believe that it requires ideal gas law.

You might be better off with a velocity inlet and pressure outlet. There are several tutorials that are similar to this that you might find helpful.

Kotabhi · August 22, 2019, 16:06

Thank you. I will work on it and let you know. About the tutorials, I have searched on YouTube regarding star ccm+ but in vain. If you know some of them, I would be extremely grateful.

bluebase · August 22, 2019, 18:52

Hi Kotabhi,

usually StarCCM is installed with its manual (if you did not choose otherwise).
The manual contains a tutorial section. Just open StarCCM and click on "Tutorial Guide" in the "Help" menu.

You'll find some introductory information you should go through. You'll also find a section on incompressible flows.
However, sometimes there are some supplementary files necessary which might are only available via the costumer portal.

Best regards,
Sebastian

August 21, 2019, 16:03	Error while using 'free stream' in region settings	#1
Kotabhi New Member Abhiijth Join Date: Aug 2019 Posts: 7 Rep Power: 7	Hello, I am new to this software and I am conducting velocity flow investigations on a bike surface. When I changed the region type of the control volume block walls into ' free stream' and initialize the solution, I receive an an error saying that it is incompatible. The error vanishes when I change their type to wall. I don't not understand this issue. I would be grateful if someone would explain this to me and let me know how if I want to continue with the ' free stream' setting. Thank you.

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August 22, 2019, 10:44		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Do you by chance have constant density model selected? I believe that it requires ideal gas law. You might be better off with a velocity inlet and pressure outlet. There are several tutorials that are similar to this that you might find helpful.

August 22, 2019, 16:06		#3
Kotabhi New Member Abhiijth Join Date: Aug 2019 Posts: 7 Rep Power: 7	Thank you. I will work on it and let you know. About the tutorials, I have searched on YouTube regarding star ccm+ but in vain. If you know some of them, I would be extremely grateful.

August 22, 2019, 18:52		#4
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 567 Rep Power: 21	Hi Kotabhi, usually StarCCM is installed with its manual (if you did not choose otherwise). The manual contains a tutorial section. Just open StarCCM and click on "Tutorial Guide" in the "Help" menu. You'll find some introductory information you should go through. You'll also find a section on incompressible flows. However, sometimes there are some supplementary files necessary which might are only available via the costumer portal. Best regards, Sebastian