porousSimpleFoam

Per · March 29, 2012, 10:30

Hi

I want to use a rotating porous media in order to disturb/set up a flow in a tank. Think of it as a porous screen or disk. From the tutorial of porousSimpleFoam I see that porous media is used for flow control, rather than setting up a flow. From the source term in the governing equation it can be seen that one needs a flow velocity in order to have a contribution from the porous media on the flow.

Does anyone know if it is possible to define a moving/rotating porous media by for instance using a moving reference frame (without altering the source code)? I have noticed that a solver named rhoPorousSimpleFoam exists. But this is for incompressible flow (I have incompressible flow), and the example did not have any MRFZones that I could see. Btw, I am using OF 2.1.0.

Thanks in advance for replies
Regards
Per

Hisham · April 15, 2012, 19:32

Hi

Try the MRFSimpleFoam. It has a tutorial!

Also a wiki entry: http://openfoamwiki.net/index.php/MR...eFoam_Tutorial

I hope these help!

Regards,
Hisham

Per · April 16, 2012, 05:01

Thanks for the reply Hisham

I have already tested MRFSimpleFoam on a case quite similar with the one you posted. This takes care of rotation of a boundary face, but I still need to include a porous zone or porous volume (which must be rotating). Any ideas?

Regards
Per

Hisham · April 16, 2012, 09:42

Hi Per,

Support for moving meshes has to be implemented in the code if it is not there. Look at interDyMFoam and interFoam to compare what you need to do. The tutorial/mesh has a dynamicMovingMesh directory for tutorials on how to move the mesh using the dynamicMoveMesh utility but not actually solving anything!

If you need to start a rotation in fluid, why not add a source term to the solver equation for body forces and set it up with some criteria to initialize the tank! This will also need digging into code.

Also, why not set the initial velocity field for a non zero value. You can use funkySetFields utility for adding an expression for cell values (i.e. based on position).

I hope you find a solution soon

Regards
Hisham

Per · April 19, 2012, 09:29

In the beginning I am trying to avoid adding new functionality (time consuming). But it might be that I have to in the end. Thanks for the tip

Regards
Per

Amjad Asad · October 24, 2015, 16:42

Hello,
I would like to know, if you could solve your problem. My case is similar to yours. I have a porous body rotating on its axis in a Cylinder filled up with water. Here, i need to consider the rotation of the porous body
Best regards,
Amjad

March 29, 2012, 10:30	porousSimpleFoam and rotating porous media	#1
Per New Member Per Christian Endresen Join Date: Feb 2012 Location: Trondheim, Norway Posts: 13 Rep Power: 14	Hi I want to use a rotating porous media in order to disturb/set up a flow in a tank. Think of it as a porous screen or disk. From the tutorial of porousSimpleFoam I see that porous media is used for flow control, rather than setting up a flow. From the source term in the governing equation it can be seen that one needs a flow velocity in order to have a contribution from the porous media on the flow. Does anyone know if it is possible to define a moving/rotating porous media by for instance using a moving reference frame (without altering the source code)? I have noticed that a solver named rhoPorousSimpleFoam exists. But this is for incompressible flow (I have incompressible flow), and the example did not have any MRFZones that I could see. Btw, I am using OF 2.1.0. Thanks in advance for replies Regards Per Last edited by Per; March 30, 2012 at 04:36.

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April 15, 2012, 19:32		#2
Hisham Senior Member Hisham Elsafti Join Date: Apr 2011 Location: Braunschweig, Germany Posts: 257 Blog Entries: 10 Rep Power: 17	Hi Try the MRFSimpleFoam. It has a tutorial! Also a wiki entry: http://openfoamwiki.net/index.php/MR...eFoam_Tutorial I hope these help! Regards, Hisham

April 16, 2012, 05:01		#3
Per New Member Per Christian Endresen Join Date: Feb 2012 Location: Trondheim, Norway Posts: 13 Rep Power: 14	Thanks for the reply Hisham I have already tested MRFSimpleFoam on a case quite similar with the one you posted. This takes care of rotation of a boundary face, but I still need to include a porous zone or porous volume (which must be rotating). Any ideas? Regards Per

April 16, 2012, 09:42		#4
Hisham Senior Member Hisham Elsafti Join Date: Apr 2011 Location: Braunschweig, Germany Posts: 257 Blog Entries: 10 Rep Power: 17	Hi Per, Support for moving meshes has to be implemented in the code if it is not there. Look at interDyMFoam and interFoam to compare what you need to do. The tutorial/mesh has a dynamicMovingMesh directory for tutorials on how to move the mesh using the dynamicMoveMesh utility but not actually solving anything! If you need to start a rotation in fluid, why not add a source term to the solver equation for body forces and set it up with some criteria to initialize the tank! This will also need digging into code. Also, why not set the initial velocity field for a non zero value. You can use funkySetFields utility for adding an expression for cell values (i.e. based on position). I hope you find a solution soon Regards Hisham

April 19, 2012, 09:29		#5
Per New Member Per Christian Endresen Join Date: Feb 2012 Location: Trondheim, Norway Posts: 13 Rep Power: 14	In the beginning I am trying to avoid adding new functionality (time consuming). But it might be that I have to in the end. Thanks for the tip Regards Per

October 24, 2015, 16:42		#6
Amjad Asad New Member Amjad Join Date: May 2012 Posts: 21 Rep Power: 14	Hello, I would like to know, if you could solve your problem. My case is similar to yours. I have a porous body rotating on its axis in a Cylinder filled up with water. Here, i need to consider the rotation of the porous body Best regards, Amjad