Optimum Size of Rotating Domain in MRF

vismech · September 9, 2009, 07:02

Hello

What is the optimum size of the rotating domain (which is the interface b/w rotaing and stationary regions) around the rotating part, while simulating rotation using MRF approach. Should i use sufficiently large domain or very closely hugging domain to the rotating body or it depends upon the shape and geometry of rotating body !

Thanks in Advance ...

kyle · September 9, 2009, 18:51

I always try to keep the rotating flow within the rotating reference frame as much as possible. If simulating an axial fan I think that it is best to hug the rotating body on the upstream side, but extend as far downstream as possible. It is questionable if this is really necessary, but that is how we do it.

Raphael_Santos · April 17, 2020, 21:01

Hello, all.

Looking for answers about what you asked, I have a second question.

Do the rotating domain must be cylindrical when I use MRF approach?

ping · April 23, 2020, 02:19

yes - essential

Raphael_Santos · April 23, 2020, 09:11

Hi Ping, thanks.

Another question, it is needed to have an interface to use cyclicAMI boundary condition? The tutorial mixerVessel2D using simpleFoam, there is no interface between the domains. Is that fine?

Do you have references to indicate concerning MRF?

Thanks,
Raphael

ping · April 24, 2020, 01:15

it looks like you are using openfoam rather than star so if this is correct please move to the correct forum since I imagine its mrf methods and rules are quite different

September 9, 2009, 07:02	Optimum Size of Rotating Domain in MRF	#1
vismech New Member vismech Join Date: Mar 2009 Posts: 5 Rep Power: 17	Hello What is the optimum size of the rotating domain (which is the interface b/w rotaing and stationary regions) around the rotating part, while simulating rotation using MRF approach. Should i use sufficiently large domain or very closely hugging domain to the rotating body or it depends upon the shape and geometry of rotating body ! Thanks in Advance ...

September 9, 2009, 18:51		#2
kyle Senior Member Join Date: Mar 2009 Location: Austin, TX Posts: 160 Rep Power: 18	I always try to keep the rotating flow within the rotating reference frame as much as possible. If simulating an axial fan I think that it is best to hug the rotating body on the upstream side, but extend as far downstream as possible. It is questionable if this is really necessary, but that is how we do it. JR22 likes this.

April 23, 2020, 02:19		#4
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	yes - essential Raphael_Santos likes this.

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April 17, 2020, 21:01		#3
Raphael_Santos New Member Raphael Santos Join Date: Oct 2013 Posts: 20 Rep Power: 13	Hello, all. Looking for answers about what you asked, I have a second question. Do the rotating domain must be cylindrical when I use MRF approach?

April 23, 2020, 09:11		#5
Raphael_Santos New Member Raphael Santos Join Date: Oct 2013 Posts: 20 Rep Power: 13	Hi Ping, thanks. Another question, it is needed to have an interface to use cyclicAMI boundary condition? The tutorial mixerVessel2D using simpleFoam, there is no interface between the domains. Is that fine? Do you have references to indicate concerning MRF? Thanks, Raphael

April 24, 2020, 01:15		#6
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	it looks like you are using openfoam rather than star so if this is correct please move to the correct forum since I imagine its mrf methods and rules are quite different