Cavitation transient flow using RANS+LES

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  • Last Post 05 June 2018
José Mantovani posted this 01 June 2018

So guys, In this afternoon I tryed to make a transient flow modeling cavitation using a RANS+LES approach. First I get a steady flow using a RANS model and second I choose the LES model and run a transient flow, but I get a error. I get some coupled error... I dont know. The continuity convergence goes above 10e+8 wtf hahaha... 

I forgot to take a screenshot so I could put it here and make it easier to see. But anyway does anyone know how to model cavitation in a transient flow using LES? Or maybe a some material learning this... 

Thanks everyone! 

Mantovani. 

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Raef.Kobeissi posted this 03 June 2018

Hi Jose,

it is difficult to see what went wrong with your simulation, could you maybe attach the Workbench File so that I can have a look.

Regards

Raef Kobeissi

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José Mantovani posted this 04 June 2018

Hello Raef,

Yes, I agree with you ... I will try again and if I can not I will make the file available here so you can help me. I got a mass balance well above tolerance, I used the SST k-omega model to prepare the transient flow. I'm going to try the k-epsilon, but I think the problem is my mesh. I can not do a structured mesh.

Thanks for the attention!

Mantovani. 

peteroznewman posted this 05 June 2018

I post this on behalf of Mantovani who had some difficulty posting and attaching the 18.2 archive.

Hello friends. So these last few days I'm trying to do some simulations of hydrodynamic cavitation. My idea is to perform two types of analysis, the first being stable and the second transient. Firstly for the stable case I simulated the cavitation phenomenon using a feasible k-epsilon turbulence model. But the behavior of the waste did not prove legal and did not fall below tolerance. Can someone help me? Below is an image of the waste along the solution. See that it enters 50 and 200 iterations they showed a gradual behavior but after that it was very random. I do not know if it is a problem in the mesh, in the configuration of the solution ... For the transient approach, I would just duplicate the file and on top of the stable solution calculate the transient flow using LES. If anyone can help me, I'm grateful. The simulation file is attached.

Attached Files

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José Mantovani posted this 05 June 2018

Thanks for helping Peter! Now here we have attached files, If someone can help me in this simulations the file is enabled.

Thanks! 

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