Mass conserving velocity boundary condition between two regions

nils2 · January 9, 2015, 06:22

Hello,
I am working on a solver similar to chtMultiRegionFoam. However, my case deals with the heat transfer from one fluid to another (non-newtonian) fluid. The newtonian and non-newtonian regions are separated by a stationary membrane. Because none of the regions is solid, I also need to couple the velocities at both sides of the interface between both regions.

To start with, the chtMultiRegionFoam uses the compressible::turbulentTemperatureCoupledBaffleMix ed BC to map the temperature T from one region (solid) to another region (fluid).

I need a similar BC to map as well the velocity U from one fluid region to another fluid region, such that rho1*U1=rho2*U2. Does such a BC exist? If not, which existing BC should I study and extend to develop the required BC?

Thanks
Nils

WildeCat · November 7, 2016, 08:13

Hello Nils,

I am currently working on a very similar problem and was curious to know if you ever figured out how to solve a mass conserving boundary condition between two fluid regions.

Cheers

yasmin · June 28, 2021, 06:37

Hiya Nils and Max,

I am working on a similar case too and I was just wondering, have you figure out the problem????

January 9, 2015, 06:22	Mass conserving velocity boundary condition between two regions	#1
nils2 New Member Nils Join Date: Jan 2015 Posts: 1 Rep Power: 0	Hello, I am working on a solver similar to chtMultiRegionFoam. However, my case deals with the heat transfer from one fluid to another (non-newtonian) fluid. The newtonian and non-newtonian regions are separated by a stationary membrane. Because none of the regions is solid, I also need to couple the velocities at both sides of the interface between both regions. To start with, the chtMultiRegionFoam uses the compressible::turbulentTemperatureCoupledBaffleMix ed BC to map the temperature T from one region (solid) to another region (fluid). I need a similar BC to map as well the velocity U from one fluid region to another fluid region, such that rho1U1=rho2U2. Does such a BC exist? If not, which existing BC should I study and extend to develop the required BC? Thanks Nils yasmin likes this.

November 7, 2016, 08:13	Default Mass conserving velocity boundary condition between two regions	#2
WildeCat New Member Max Join Date: Sep 2016 Location: Delft Posts: 22 Rep Power: 9	Hello Nils, I am currently working on a very similar problem and was curious to know if you ever figured out how to solve a mass conserving boundary condition between two fluid regions. Cheers yasmin likes this.

June 28, 2021, 06:37		#3
yasmin New Member yasmin Join Date: Mar 2021 Posts: 2 Rep Power: 0	Hiya Nils and Max, I am working on a similar case too and I was just wondering, have you figure out the problem???? Last edited by yasmin; June 28, 2021 at 07:45.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wind turbine simulation	Saturn	CFX	60	July 17, 2024 05:45
Overflow Error in Multiphase Modelling with Two Continuous Fluids	ashtonJ	CFX	6	August 11, 2014 14:32
CFX fails to calculate a diffuser pipe flow	shenying0710	CFX	7	March 26, 2013 04:13
error message	cuteapathy	CFX	14	March 20, 2012 06:45
mass transfer coefficient for boundary condition	niek	Main CFD Forum	0	March 29, 2011 05:33