Setting 'Reference Values'?

woodmark75 · February 14, 2015, 17:14

Hi, I'm attempting to simulate a scaled model I have in a 'low speed' wind tunnel.

I've set up Fluent with; Inlet Velocity & Outlet Pressure. Outlet set to 0 Pa i.e gauge pressure. My query is what I should set the pressure to in 'reference Values'?

Should it be set to 1 atmosphere i.e. 101325 Pa? Also under; Define>Operating Conditions, should I include gravity? (Haven't seen this done in any tutorials). Thanks in advance...

Tanmay95 · February 15, 2015, 10:49

Reference value are used to calculate quantities in report like drag coefficient.And gravity sets body force in z-direction as -rho*g.Its generally used if your flow is affected by gravity like water flowing down a pipe.In case you want to use gravity model have to be prepaid properly with xy plane as horizontal and z as height.

February 14, 2015, 17:14	Setting 'Reference Values'?	#1
woodmark75 New Member Mark Join Date: Nov 2014 Posts: 21 Rep Power: 11	Hi, I'm attempting to simulate a scaled model I have in a 'low speed' wind tunnel. I've set up Fluent with; Inlet Velocity & Outlet Pressure. Outlet set to 0 Pa i.e gauge pressure. My query is what I should set the pressure to in 'reference Values'? Should it be set to 1 atmosphere i.e. 101325 Pa? Also under; Define>Operating Conditions, should I include gravity? (Haven't seen this done in any tutorials). Thanks in advance...

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February 15, 2015, 10:49		#2
Tanmay95 New Member Tanmay Inamdar Join Date: Jan 2015 Posts: 10 Rep Power: 11	Reference value are used to calculate quantities in report like drag coefficient.And gravity sets body force in z-direction as -rho*g.Its generally used if your flow is affected by gravity like water flowing down a pipe.In case you want to use gravity model have to be prepaid properly with xy plane as horizontal and z as height.