operating Conditions

nenazarian · July 25, 2012, 18:08

Hi

I am trying to simulate urban area (uniform rows and columns of cubes) using fluent.

I have used Boussinesq approximation for density specification and Im just confused about the operating conditions, such as operating temperature and pressure. or even if its necessary to specify an operating density.
What I understand from the user guide is that these specifications are mostly significant when using ideal-gas law.

I would appreciate if anyone has any suggestion or explanation.

Cheers
Negin

eng_s_sadeghi · July 26, 2012, 00:02

It's not so important. But if the gravity has any effect, enable it and also specify the origin of the operating pressure (mostly used in free channel flows). Density is just in ideal gas law.

nenazarian · July 26, 2012, 14:35

Thanks for your respond.

I just have one more question.
Im using solar load and running the case for each hour of day. I have periodic boundary condition that I specify the bulk stream temperature and mass flow rate in there.

Do you think I should put the operating temperature same as bulk stream temperature in each hour?

Cheers
Negin

July 25, 2012, 18:08	operating Conditions	#1
nenazarian Member Negin Nazarian Join Date: Jan 2012 Location: San Diego Posts: 61 Rep Power: 15	Hi I am trying to simulate urban area (uniform rows and columns of cubes) using fluent. I have used Boussinesq approximation for density specification and Im just confused about the operating conditions, such as operating temperature and pressure. or even if its necessary to specify an operating density. What I understand from the user guide is that these specifications are mostly significant when using ideal-gas law. I would appreciate if anyone has any suggestion or explanation. Cheers Negin

July 26, 2012, 00:02		#2
eng_s_sadeghi Member Join Date: Mar 2011 Posts: 64 Rep Power: 16	It's not so important. But if the gravity has any effect, enable it and also specify the origin of the operating pressure (mostly used in free channel flows). Density is just in ideal gas law. __________________ Saeed Sadeghi Ansys Fluent CFD Consultant

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July 26, 2012, 14:35		#3
nenazarian Member Negin Nazarian Join Date: Jan 2012 Location: San Diego Posts: 61 Rep Power: 15	Thanks for your respond. I just have one more question. Im using solar load and running the case for each hour of day. I have periodic boundary condition that I specify the bulk stream temperature and mass flow rate in there. Do you think I should put the operating temperature same as bulk stream temperature in each hour? Cheers Negin