[AHF]

Hi
can any one help me on "Flow Direction" option in periodic boundary condition ?
i didn't understand what is it and how set it
thanks

[AHF]

Originally Posted by AHF

Hi
can any one help me on "Flow Direction" option in periodic boundary condition ?
i didn't understand what is it and how set it
thanks

any help ?

[Far]

what do you mean by flow direction?

[aja1345]

Originally Posted by AHF

Hi
can any one help me on "Flow Direction" option in periodic boundary condition ?
i didn't understand what is it and how set it
thanks

I am simulating a turbine and I have Rotational periodic conditions. Here, I think that ""Flow Direction" should be set based on right hand rule.

[Far]

things are confusing here. You are saying periodic boundary conditions and at the same time you are saying flow direction.!!!!

[aja1345]

Originally Posted by Far

things are confusing here. You are saying periodic boundary conditions and at the same time you are saying flow direction.!!!!

[Far]

what type of flow problem you are solving??


It is very much clear. It is direction in which you have pressure gradient. And it has nothing to do with right hand rule... !!!

And are you sure that you need this boundary condition?

[aja1345]

Originally Posted by Far

what type of flow problem you are solving??


It is very much clear. It is direction in which you have pressure gradient. And it has nothing to do with right hand rule... !!!

And are you sure that you need this boundary condition?

What is your exact meaning of "It is direction in which you have pressure gradient."?

My static pressure contour is as follows:


According to above explanations, how do I set this direction?

[Far]

do not make any settings for this boundary.

[aja1345]

Originally Posted by Far

do not make any settings for this boundary.

Why?

Can you explain more about that?

Thanks

[Far]

these settings for some special problems. They are not for the case you are simulating. So just leave these settings on default...

[AHF]

i will be thankful if any body can help me

this is my problem as seen in the picture attacked

rear and front wall are periodic and also this trapezoidal enclosure is incline. ( gamma angle in picture)
i set rear and front as periodic without any special setting . that is enough ?
or i should change flow direction. please attention that trapezoidal enclosure isn't flat and it is incline

thanks

[Far]

Originally Posted by AHF

i will be thankful if any body can help me

this is my problem as seen in the picture attacked

rear and front wall are periodic and also this trapezoidal enclosure is incline. ( gamma angle in picture)
i set rear and front as periodic without any special setting . that is enough ?
or i should change flow direction. please attention that trapezoidal enclosure isn't flat and it is incline

thanks

Please start a new thread.

[AHF]

Originally Posted by Far

Please start a new thread.

i myself create this threat

can you help me

[Far]

flow direction is used when you have pressure gradient in some direction. for example if you have long pipe and you want to model just a some finite length.


So at inlet and outlet, you just put the periodic conditions and provide direction and pressure gradient. So if pipe length is in x direction then you put direction as 1 0 0

[AHF]

Originally Posted by Far

flow direction is used when you have pressure gradient in some direction. for example if you have long pipe and you want to model just a some finite length.


So at inlet and outlet, you just put the periodic conditions and provide direction and pressure gradient. So if pipe length is in x direction then you put direction as 1 0 0

so , if i have periodic condition without pressure gradient , its unnecessary to define flow direction ?