Problem with Nozzle in CFD study

Jorge_TER · January 4, 2021, 05:28

Hello everyone, I have a question with the CFD study of my nozzle. It is a DF-49 industrial nozzle from Koolair. Currently I have a very small mesh that is viable, but it requires too much calculation time, which makes operations difficult.

Regarding the mesh, I have used a structured polyhedral mesh, with meshing of the boundary layer in the form of prisms. Regarding the treatment of the wall area, I want to do it with a Wall Law, from a y + = 300 to a y + = 50.

The flow regime I have used is (Incompressible / Subsonic). The main study is done on the inlet pressure to the nozzle. The range of pressure values that we are going to study goes from X Mp to Y Mp.

As for the turbulence of my study fluid, I am going to choose a Standard K-Epsilon turbulence model.

My doubt is that I can't figure out how to mesh correctly and check the convergence, exactly, in a quali-quantitative way, to be able to affirm that the convergence is real.

I would appreciate help, I'm stuck.

fluid23 · January 4, 2021, 09:05

Your question is not clear. Are you asking how to verify your results are independent of your mesh?

Jorge_TER · January 7, 2021, 03:46

Both, Independence and convergence

January 4, 2021, 05:28	Problem with Nozzle in CFD study	#1
Jorge_TER New Member Jorge Ortiz Join Date: Jan 2021 Posts: 2 Rep Power: 0	Hello everyone, I have a question with the CFD study of my nozzle. It is a DF-49 industrial nozzle from Koolair. Currently I have a very small mesh that is viable, but it requires too much calculation time, which makes operations difficult. Regarding the mesh, I have used a structured polyhedral mesh, with meshing of the boundary layer in the form of prisms. Regarding the treatment of the wall area, I want to do it with a Wall Law, from a y + = 300 to a y + = 50. The flow regime I have used is (Incompressible / Subsonic). The main study is done on the inlet pressure to the nozzle. The range of pressure values that we are going to study goes from X Mp to Y Mp. As for the turbulence of my study fluid, I am going to choose a Standard K-Epsilon turbulence model. My doubt is that I can't figure out how to mesh correctly and check the convergence, exactly, in a quali-quantitative way, to be able to affirm that the convergence is real. I would appreciate help, I'm stuck.

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January 4, 2021, 09:05		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Your question is not clear. Are you asking how to verify your results are independent of your mesh?

January 7, 2021, 03:46		#3
Jorge_TER New Member Jorge Ortiz Join Date: Jan 2021 Posts: 2 Rep Power: 0	Both, Independence and convergence