Different Transport Properties for Different CellZones

yesaswi92 · April 3, 2014, 11:03

Hello,

I am trying to solve for a thermal flow with a porous plug. So there will be two cellZones in the mesh
- Fluid
- Porous Domain

The momentum equations for both the domains are different. porousSimpleFoam uses a subroutine to modify the governing equation in the porous zone. So there is no issue for flow solution.

Now to extend the same solver for thermal flow, I added the energy equation. For porous domain, the energy equation is same as it is for fluid domain. Only the transport properties will be different (In porous domain the thermal diffusivity is a volume averaged diffusivity of both the porous material and the fluid).

So I need to give two separate thermal diffusivity values for these two cellZones in the transportProperties file. Can anyone help me in implementing this?

Thank You
Yesaswi

{PS: In multiphase flows, we define the properties of two phases separately. Can I do that for the two cellzones separately?}

AJAY BHANDARI · July 11, 2015, 01:33

Hi,
I have the same problem. I am simulating flow through a body tissue which is considered as a porous media. i have a rectangular mesh in which there a two concentric circles.all these three parts are different . they have same porosity but there transport properties are different. I have to assign different transport properties to all these parts. How can i implement this??? How can i assign different transport properties to different zones????? Do i have to code for this??? Plz suggest. Any kind of help will be appreciated....

catelyn · June 29, 2016, 12:33

Hello!
Did you solve the problem?
I think I've a similar problem in defining a gravity field that depends on zones.
Could you help me?

AJAY BHANDARI · June 30, 2016, 01:16

Hi Catelyn,

Yes you can do it by making a setFieldDict file.

There you assign the properties to different zones. There are lot of zone geometries available like cylinderTo cell, Box To cell.

You can select it according to your choice and then assign properties.

After doing that type setFields on terminal.

I hope this helps..

Best
Ajay

catelyn · June 30, 2016, 04:55

Hi Ajay,
thank you for the reply.
I thought that setFields worked with "variables" (pressure, velocity) of the fields to be specified as initial conditions. Typing "setFields", in fact, the files contained in 0 folder change according to the instructions in setFieldsDict.
What I need is to diversify the properties (defined in constant) depending on the position.

Catelyn

ancolli · February 15, 2017, 06:50

Quote:

Originally Posted by catelyn

Hi Ajay,
thank you for the reply.
I thought that setFields worked with "variables" (pressure, velocity) of the fields to be specified as initial conditions. Typing "setFields", in fact, the files contained in 0 folder change according to the instructions in setFieldsDict.
What I need is to diversify the properties (defined in constant) depending on the position.

Catelyn

Did u manage to solve your problem? Can u explain to me?

alok1463 · March 20, 2019, 08:40

Hi catelyn,

Did you find any way to solve your problem? I am facing similar problem.

ancolli · March 20, 2019, 09:04

You should create a new field with your variable property and locate it in the 0 directory. It has no sense to have a "constant" (variable) transport property.

April 3, 2014, 11:03	Different Transport Properties for Different CellZones	#1
yesaswi92 New Member Yesaswi Join Date: Jan 2014 Posts: 26 Rep Power: 11	Hello, I am trying to solve for a thermal flow with a porous plug. So there will be two cellZones in the mesh - Fluid - Porous Domain The momentum equations for both the domains are different. *porousSimpleFoam* uses a subroutine to modify the governing equation in the porous zone. So there is no issue for flow solution. Now to extend the same solver for thermal flow, I added the energy equation. For porous domain, the energy equation is same as it is for fluid domain. Only the transport properties will be different (In porous domain the thermal diffusivity is a volume averaged diffusivity of both the porous material and the fluid). So I need to give two separate thermal diffusivity values for these two cellZones in the transportProperties file. Can anyone help me in implementing this? Thank You Yesaswi {PS: In multiphase flows, we define the properties of two phases separately. Can I do that for the two cellzones separately?}

July 11, 2015, 01:33	Different transport properties to different cell zones	#2
AJAY BHANDARI Member AJAY BHANDARI Join Date: Jul 2015 Location: INDIA Posts: 57 Rep Power: 9	Hi, I have the same problem. I am simulating flow through a body tissue which is considered as a porous media. i have a rectangular mesh in which there a two concentric circles.all these three parts are different . they have same porosity but there transport properties are different. I have to assign different transport properties to all these parts. How can i implement this??? How can i assign different transport properties to different zones????? Do i have to code for this??? Plz suggest. Any kind of help will be appreciated....

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June 29, 2016, 12:33		#3
catelyn New Member Join Date: Mar 2016 Posts: 7 Rep Power: 9	Hello! Did you solve the problem? I think I've a similar problem in defining a gravity field that depends on zones. Could you help me?

June 30, 2016, 01:16		#4
AJAY BHANDARI Member AJAY BHANDARI Join Date: Jul 2015 Location: INDIA Posts: 57 Rep Power: 9	Hi Catelyn, Yes you can do it by making a setFieldDict file. There you assign the properties to different zones. There are lot of zone geometries available like cylinderTo cell, Box To cell. You can select it according to your choice and then assign properties. After doing that type setFields on terminal. I hope this helps.. Best Ajay

June 30, 2016, 04:55		#5
catelyn New Member Join Date: Mar 2016 Posts: 7 Rep Power: 9	Hi Ajay, thank you for the reply. I thought that setFields worked with "variables" (pressure, velocity) of the fields to be specified as initial conditions. Typing "setFields", in fact, the files contained in 0 folder change according to the instructions in setFieldsDict. What I need is to diversify the properties (defined in constant) depending on the position. Catelyn

March 20, 2019, 08:40		#7
alok1463 New Member ALOK KUMAR Join Date: Apr 2016 Posts: 2 Rep Power: 0	Hi catelyn, Did you find any way to solve your problem? I am facing similar problem.

March 20, 2019, 09:04		#8
ancolli Senior Member Alejandro Join Date: Jan 2014 Location: Argentina Posts: 125 Rep Power: 11	You should create a new field with your variable property and locate it in the 0 directory. It has no sense to have a "constant" (variable) transport property.