How to transform boundary condition from 3D to 2D?

nurul efha · October 17, 2012, 23:23

Hello everybody,

I'm using CFD-Fluent to simulate gasification. In my case, mass flow rate that enter gasifier column is 0,0074 kg/s of coal. I want to simulate with 2D geometry. Only half of the domain with is modeled because of symmetry. Is it same the number of mass flow rate in 3D and 2D? Is the mass flow rate used in 2D unchanged (0,0074 kg/s)? Or the mass flow rate must be devided to transform in 2D? I hope you can help me. Thanks.

agd · October 18, 2012, 08:45

The easiest approach is to compute the mass flux (mass flow/area) and then use that to determine what the mass flow rate would be on the modified inlet areas. In other words, scale the mass flow by the ratio of the areas.

nurul efha · October 18, 2012, 21:51

Thank you very much. I will try it.

October 17, 2012, 23:23	How to transform boundary condition from 3D to 2D?	#1
nurul efha New Member Nurul Join Date: Sep 2012 Posts: 15 Rep Power: 13	Hello everybody, I'm using CFD-Fluent to simulate gasification. In my case, mass flow rate that enter gasifier column is 0,0074 kg/s of coal. I want to simulate with 2D geometry. Only half of the domain with is modeled because of symmetry. Is it same the number of mass flow rate in 3D and 2D? Is the mass flow rate used in 2D unchanged (0,0074 kg/s)? Or the mass flow rate must be devided to transform in 2D? I hope you can help me. Thanks. Last edited by nurul efha; October 18, 2012 at 04:08.

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October 18, 2012, 08:45		#2
agd Senior Member Join Date: Jul 2009 Posts: 351 Rep Power: 18	The easiest approach is to compute the mass flux (mass flow/area) and then use that to determine what the mass flow rate would be on the modified inlet areas. In other words, scale the mass flow by the ratio of the areas.

October 18, 2012, 21:51		#3
nurul efha New Member Nurul Join Date: Sep 2012 Posts: 15 Rep Power: 13	Thank you very much. I will try it.