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-   -   MRF IN FLUENT HELP (http://www.cfd-online.com/Forums/fluent/44348-mrf-fluent-help.html)

H.A.S April 4, 2007 13:08

MRF IN FLUENT HELP
 
Hello,

I have a brick where there is a wind turbine inside it , i substracted the two volumes and meshed . When i was working on Fluent , I choose the following boundaries : Velocity inlet , Pressure outlet , and all other faces are indicated as walls . is it right ?? . I am working on Multiple reference frame ;

any advice ,

Regards


sam April 4, 2007 23:45

Re: MRF IN FLUENT HELP
 
Yes it seems right.

what about the periodic boundary

regards


H.A.S April 5, 2007 01:30

Re: MRF IN FLUENT HELP
 
Thanks for your reply ,

I didnt take into account any periodic boundary ? Should I ? if yes , what are the best periodic boundaries that i should take ? I have a Vertical Axis wind turbine .

Thanks in advance , Regards

sam April 5, 2007 23:33

Re: MRF IN FLUENT HELP
 
Are you modeling all blades in your case. If you want to model only one then you need to use the periodic condtion. and as far as periodic condition is concernt, you just need to define it, no need to enter any thing else (except the type of periodicy i.e transtational or rotational).


H.A.S April 6, 2007 03:54

Re: MRF IN FLUENT HELP
 
yes , i am modeling all the blades (3 blades) , i amworking on Darius model . I read about the periodic condition in the documentation , but u said that it is applicable only in 1 blade ?


sam April 9, 2007 01:12

Re: MRF IN FLUENT HELP
 
yes if you want to model only one blade (i.e one third of your fluid domain). this will redcude your computational cost e.g if you have .3 million nodes in 3 blade passage then by solving one blade passage (periodic boundary condition enforced) you have only 0.1 million nodes.

But it is not compulsory to do so(but most of the people do so).

you should also go to fluent web site and there is one example related to your problem type (fluent newsletter)

thanks

H.A.S April 9, 2007 08:32

Re: MRF IN FLUENT HELP
 
Thanks for your help , the newsletter seems important , i got it and sign up with it ; Thanks H.A.S


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