CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

MRFSimpleFoam with 2 rotors

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   December 15, 2008, 16:06
Default Hi OpenFoam User, I have a
  #1
New Member
 
Volker Ludewig
Join Date: Mar 2009
Location: Chemnitz, saxony, germany
Posts: 12
Rep Power: 7
tommie is on a distinguished road
Hi OpenFoam User,

I have a problem with MRFSimpleFoam:
MRF is normally very useful to simulate two rotors which are combing into each other.
Applications for MRF would be: "Double screw feeder" or rotating piston pumps or mixer for the kitchen.
To simulate this, the patch of internal faces for describing the rotor region (the mesh doesn't move by MRF…) can't be cylindrical.
I listened, that MRF in Fluent can do this without problems.
But unfortunately, as soon as the patch of internal faces is not cylindrical, the result is a little bit wrong.
What could I change in the MRF- Source to solve the problem?
Many thanks for all hints in advance.

Kind regards






tommie is offline   Reply With Quote

Old   December 15, 2008, 18:41
Default I am working on a similar case
  #2
Member
 
Hai Yu
Join Date: Mar 2009
Location: OvgU, Magdeburg
Posts: 65
Rep Power: 7
yuhai is on a distinguished road
I am working on a similar case like you: A flow from left to right, with a turbo rotating in middle.
First of all, maybe I am not right.
As far as I know, MRF is only suitable for the situation that the the values of parameters around the interface is alike.
Maybe you should look at icoDyMFoam and turbDyMFoam?
I am also eager to know your results.
yuhai is offline   Reply With Quote

Old   December 16, 2008, 10:02
Default Hi Yu Hai, hi all, I am not s
  #3
New Member
 
Volker Ludewig
Join Date: Mar 2009
Location: Chemnitz, saxony, germany
Posts: 12
Rep Power: 7
tommie is on a distinguished road
Hi Yu Hai, hi all,
I am not sure, but I think icoDyMFoam and turbDyMFoam is for rotating and oscillating meshes into static meshes. I am also interested in non Newton flows.
I my case the 2 rotor meshes can't be cylindrical. I thought MRF should manage this.



What can I do ??

Kind regards
tommie is offline   Reply With Quote

Old   December 16, 2008, 10:57
Default It looks like both your rotors
  #4
Senior Member
 
dmoroian's Avatar
 
Dragos
Join Date: Mar 2009
Posts: 644
Rep Power: 10
dmoroian is on a distinguished road
It looks like both your rotors spin in the same direction +Oz. I don't think that's possible. Put them to rotate in opposite directions.

I hope this is helpful,
Dragos
dmoroian is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
MRFSimpleFoam PropellerMixer tino_boelke OpenFOAM Running, Solving & CFD 0 December 17, 2008 10:25
MRFSimpleFoam xdanielx OpenFOAM Running, Solving & CFD 0 December 17, 2008 01:28
Equations in the MRFsimpleFOAM waynezw0618 OpenFOAM Running, Solving & CFD 4 June 30, 2008 12:32
Rotors and Propellers Cheem FLUENT 3 September 24, 2003 02:34
Rotors and Propellers Tank Main CFD Forum 0 September 15, 2003 05:21


All times are GMT -4. The time now is 08:39.