Buoyancy effect

Musa Dirar · April 12, 2016, 14:40

I want to simulate cold air (290 K) enters a room with velocity 0.4 m/s , and to bend downward when it comes out from diffuser (the inlet) by the buoyancy effect, how this can be made in ANSYS Fluent 14.0 ?

LuckyTran · April 12, 2016, 15:57

Activate the gravity option (where you select pressure-based/density-based and steady vs transient). Enable the energy equation in the models.

You also need to use an appropriate equation of state. At the minimum, the Boussinesq approximation should be used for the density. Or you can also use ideal gas law, etc. This is in material properties.

Musa Dirar · April 13, 2016, 00:41

Thank you Lucky Tran , the inflow bent downward due to buoyancy effect , but the solution didn't converge ( i used 10000 iterations and residuals as default) , i want to control the solution to converge , can anyone help me?

April 12, 2016, 14:40	Buoyancy effect	#1
Musa Dirar New Member Musa Idris Dirar Join Date: Mar 2016 Posts: 5 Rep Power: 10	I want to simulate cold air (290 K) enters a room with velocity 0.4 m/s , and to bend downward when it comes out from diffuser (the inlet) by the buoyancy effect, how this can be made in ANSYS Fluent 14.0 ?

April 12, 2016, 15:57		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,673 Rep Power: 65	Activate the gravity option (where you select pressure-based/density-based and steady vs transient). Enable the energy equation in the models. You also need to use an appropriate equation of state. At the minimum, the Boussinesq approximation should be used for the density. Or you can also use ideal gas law, etc. This is in material properties. hashim13 and luonghungtruyen like this.

April 13, 2016, 00:41	solution control	#3
Musa Dirar New Member Musa Idris Dirar Join Date: Mar 2016 Posts: 5 Rep Power: 10	Thank you Lucky Tran , the inflow bent downward due to buoyancy effect , but the solution didn't converge ( i used 10000 iterations and residuals as default) , i want to control the solution to converge , can anyone help me?

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