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Posted:
1 decade ago
Mar 1, 2010, 5:13 a.m. EST

why you cannot define the region as a moving subdomain using ale feature?

why you cannot define the region as a moving subdomain using ale feature?

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Posted:
1 decade ago
Mar 1, 2010, 5:27 a.m. EST

Hi Jean,

Thanks for the reply.

I cannot specify the region as moving subdomain because the size and shape of the region is also continuously changing. Ok. I ll try to explain the problem more clearly.

I have a 2d domain and I am moving the boundary of the domain over time using 'ale'. As the boundary is moving the volume of the domain is shrinking. When you think about it, when the domain is shrinking the concentration(moles/m3) inside the domain should be increasing, but this doesn't happen automatically due to 'ale'. So now I have to add the no of moles that was in the 'volume that shrunk' every time step artificially as inflow flux. How can I do that?.

Cheers,

Jo

Hi Jean,
Thanks for the reply.
I cannot specify the region as moving subdomain because the size and shape of the region is also continuously changing. Ok. I ll try to explain the problem more clearly.
I have a 2d domain and I am moving the boundary of the domain over time using 'ale'. As the boundary is moving the volume of the domain is shrinking. When you think about it, when the domain is shrinking the concentration(moles/m3) inside the domain should be increasing, but this doesn't happen automatically due to 'ale'. So now I have to add the no of moles that was in the 'volume that shrunk' every time step artificially as inflow flux. How can I do that?.
Cheers,
Jo

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Posted:
1 decade ago
Mar 1, 2010, 5:34 a.m. EST

I dont understand if you resolve the equation inside the said domain i the moving frame you conserve mass and increase convcentration.

On which frame do you solve your equations inside the domain the reference frame or the moving frame?

I am not [ BY FAR] an expert on Comsol but I have solved a problem where a bubble gas was compressed and deformed using ale technique and the pressure augmented and the mass was conserved...

I dont understand if you resolve the equation inside the said domain i the moving frame you conserve mass and increase convcentration.
On which frame do you solve your equations inside the domain the reference frame or the moving frame?
I am not [ BY FAR] an expert on Comsol but I have solved a problem where a bubble gas was compressed and deformed using ale technique and the pressure augmented and the mass was conserved...

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Posted:
1 decade ago
Mar 1, 2010, 9:02 p.m. EST

I am not sure if the mass is conserved in my case. May be I am doing something wrong. I ll check on that. Anyways is there a way I can get sub domain integration values during the solution. i.e I need to feed the subdomain integral value of one time step as the input to the next time step?

I am not sure if the mass is conserved in my case. May be I am doing something wrong. I ll check on that. Anyways is there a way I can get sub domain integration values during the solution. i.e I need to feed the subdomain integral value of one time step as the input to the next time step?

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Posted:
1 decade ago
Mar 1, 2010, 10:20 p.m. EST

Refer 'Integration Coupling Variables' help file.

Options> integration coupling variables > subdomain

You just have to specify the variable to be integrated and the domain to be integrated and the value can be made available globally and you can use it at any time point during the solution.

Refer 'Integration Coupling Variables' help file.
Options> integration coupling variables > subdomain
You just have to specify the variable to be integrated and the domain to be integrated and the value can be made available globally and you can use it at any time point during the solution.