Modeling a convergent divergent bell nozzle

Syed Wajeeh · March 10, 2022, 00:47

Hello all, I am analyzing a convergent divergent bell nozzle and I have tried different models during analysis i.e., starting from inviscid then laminar and following with k-epsilon and k-omega. I am a bit new to CFD and I wanna know that which model and then sub model like standard, RNG etc. will be adequate for my simulations ?

Indra · March 10, 2022, 05:53

Quote:

Originally Posted by Syed Wajeeh

Hello all, I am analyzing a convergent divergent bell nozzle and I have tried different models during analysis i.e., starting from inviscid then laminar and following with k-epsilon and k-omega. I am a bit new to CFD and I wanna know that which model and then sub model like standard, RNG etc. will be adequate for my simulations ?

I'd say stick with k-w SSt model.

Syed Wajeeh · March 10, 2022, 11:55

Thank you Indra. But can you please help me with an adequate reason for sticking to k-w SST? So that I can defend my choice properly.

LuckyTran · March 10, 2022, 14:54

The model that is adequate for your case is the one that is adequate for your case. You've already run them. You can assess whether or not they are adequate (by just looking). If they're not adequate, then you can resume your search for another model or whatever you think is needed to make it adequate. Basically, define adequacy in your own words and use that as a measure of your own work.

If you are so new to CFD and fluid dynamics that you really have no clue what is or is not adequate, well then it doesn't matter which model you use.

Syed Wajeeh · March 11, 2022, 01:44

Got it. Cheers

March 10, 2022, 00:47	Modeling a convergent divergent bell nozzle	#1
Syed Wajeeh Member Syed Wajeeh Join Date: Mar 2022 Posts: 56 Rep Power: 4	Hello all, I am analyzing a convergent divergent bell nozzle and I have tried different models during analysis i.e., starting from inviscid then laminar and following with k-epsilon and k-omega. I am a bit new to CFD and I wanna know that which model and then sub model like standard, RNG etc. will be adequate for my simulations ?

March 10, 2022, 14:54		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	The model that is adequate for your case is the one that is adequate for your case. You've already run them. You can assess whether or not they are adequate (by just looking). If they're not adequate, then you can resume your search for another model or whatever you think is needed to make it adequate. Basically, define adequacy in your own words and use that as a measure of your own work. If you are so new to CFD and fluid dynamics that you really have no clue what is or is not adequate, well then it doesn't matter which model you use. Syed Wajeeh likes this.

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March 10, 2022, 11:55		#3
Syed Wajeeh Member Syed Wajeeh Join Date: Mar 2022 Posts: 56 Rep Power: 4	Thank you Indra. But can you please help me with an adequate reason for sticking to k-w SST? So that I can defend my choice properly.

March 11, 2022, 01:44		#5
Syed Wajeeh Member Syed Wajeeh Join Date: Mar 2022 Posts: 56 Rep Power: 4	Got it. Cheers