How to set the initial boundary conditions for a mixing layer flow?

marialhm · April 7, 2017, 06:07

Dear all,

Recently I'm interested in mixing layer flow, but after trying some cases, I cant get the expected flow field (i.e. the vorticity distribution), I think it must be the setting of the initial boundary conditions, so does anyone has the experience of mixing layer flow? Can you help me ?

Thanks in advance.

Regards,

Maria

FMDenaro · April 7, 2017, 06:38

Quote:

Originally Posted by marialhm

Dear all,

Recently I'm interested in mixing layer flow, but after trying some cases, I cant get the expected flow field (i.e. the vorticity distribution), I think it must be the setting of the initial boundary conditions, so does anyone has the experience of mixing layer flow? Can you help me ?

Thanks in advance.

Regards,

Maria

Hello,
have a look at Sec. 5.2 and references in this paper
https://www.researchgate.net/publica...-uniform_grids

marialhm · April 8, 2017, 00:30

Thanks.
But I still dont know where I am wrong. I'm trying a model of 12*12, and I tried different values of velocity, but the flow fields are not good. I read the references, and found that the Re number was calculated using the initial vorticity thickness. Could you tell me how to calculate the vorticity thickness? Thanks again.

Maria

marialhm · April 8, 2017, 00:31

Quote:

Originally Posted by FMDenaro

Hello,
have a look at Sec. 5.2 and references in this paper
https://www.researchgate.net/publica...-uniform_grids

Thanks.
But I still dont know where I am wrong. I'm trying a model of 12*12, and I tried different values of velocity, but the flow fields are not good. I read the references, and found that the Re number was calculated using the initial vorticity thickness. Could you tell me how to calculate the vorticity thickness? Thanks again.

Maria

FMDenaro · April 8, 2017, 03:24

If you read the paper, delta1 is the vorticity thickness so that when you set the non-dimensional lenghts of the domain it is prescribed, not computed

April 7, 2017, 06:07	How to set the initial boundary conditions for a mixing layer flow?	#1
marialhm Member Maria Join Date: Jul 2013 Posts: 84 Rep Power: 12	Dear all, Recently I'm interested in mixing layer flow, but after trying some cases, I cant get the expected flow field (i.e. the vorticity distribution), I think it must be the setting of the initial boundary conditions, so does anyone has the experience of mixing layer flow? Can you help me ? Thanks in advance. Regards, Maria

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April 8, 2017, 00:30		#3
marialhm Member Maria Join Date: Jul 2013 Posts: 84 Rep Power: 12	Thanks. But I still dont know where I am wrong. I'm trying a model of 12*12, and I tried different values of velocity, but the flow fields are not good. I read the references, and found that the Re number was calculated using the initial vorticity thickness. Could you tell me how to calculate the vorticity thickness? Thanks again. Maria

April 8, 2017, 03:24		#5
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,768 Rep Power: 71	If you read the paper, delta1 is the vorticity thickness so that when you set the non-dimensional lenghts of the domain it is prescribed, not computed