operating conditons?

tkor · July 5, 2023, 22:31

The flow in the piping is analyzed.
I am using Ansys fluent.

Inside the piping is water and outside the inlet/outlet is air.

Do I need to enable Gravity and Specified Operating Density(1.225[kg/m3]) in Physics>Solver>OperatingCondition in such a case?

MKuhn · July 7, 2023, 04:19

If you like to model the natural convection around your pipe, you have to switch on gravity. In the material tab choose for density incompressible ideal gas.
There is another option, without modelling the air around the pipe. Just choose convection boundary and take about 10 W/(m²K) for the heat transfer coefficient.

July 5, 2023, 22:31	operating conditons?	#1
tkor New Member tkor Join Date: Apr 2023 Posts: 9 Rep Power: 3	The flow in the piping is analyzed. I am using Ansys fluent. Inside the piping is water and outside the inlet/outlet is air. Do I need to enable Gravity and Specified Operating Density(1.225[kg/m3]) in Physics>Solver>OperatingCondition in such a case?

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July 7, 2023, 04:19		#2
MKuhn Senior Member Moritz Kuhn Join Date: Apr 2010 Location: Germany, Dresden Posts: 218 Rep Power: 17	If you like to model the natural convection around your pipe, you have to switch on gravity. In the material tab choose for density incompressible ideal gas. There is another option, without modelling the air around the pipe. Just choose convection boundary and take about 10 W/(m²K) for the heat transfer coefficient.