[junbbung]

I model bingham plastic, unsteady, vof(paste and water)..

the flow is laminar..(never turbulent)

well.. the channel I model is micro-channel and the wall roughness is very important.

Usually, in the laminar, the wall roughness doesn't affect the flow..

But as I know, in micro-channel, the wall roughness is very important for the pressure drop though the flow is laminar.

So I have to change the wall roughness condition, but in fluent the wall roughness condition is not activated in laminar flow...

of course I know, the roughness condition is activated in turbulent...
But what I need is the method to change the wall roughness condition in laminar flow..


using UDF... is this possible??

or is there other method?


well.. is there a method that I set the turbulent setting and give some appropriate value for the laminar flow?

I am really wondering that...

and, i ask you an advice about whether this is possible or not in fluent setting... please...

[ammm]

if you set a turbulent viscous and change roughness but you have a laminar flow it doesnt make a significant change

[Cesar Cabrera]

Hello!

I am trying to simulate the jet from a laminar flow pipe. I have not been able to model the geometry to define the two phases of fluids, water and air

Can anybody help me?

thanks in advance

César