[whyjackeyson]

Hello everyone,

I am trying to model a simple membrane module with CFX. Currently, I have finished a msh file and I prepare to import the msh into CFX-Pre. However, I can not find any methods to choose a face to define the boundary condition. I can only choose the whole wall faces, but not a single face. I'd like to know that how to solve the problem.

I'm a new one in CFX. Hope for help and I would appreciate that very much.

jackeyson

[urosgrivc]

In the mesher make NAMED SELECTIONS
with this you will be able to select faces and give them names, you willl be able to call those names of faces in cfxPRE.

I suggest you always use named selections these are wery important and usefull.

[whyjackeyson]

Thanks for your help and suggestion!!

[sohrabmajd]

how i can use a formula for inlet velocity or other conditions?
I want to set inlet velocity of a rotating domain to
V=Va+V0.sin(Wn.t)
my model is a propeller.

[ghorrocks]

Use of CEL, the CFX expression language, is covered in the CFX tutorials. You can download these from the ANSYS customer website.

[sohrabmajd]

Originally Posted by ghorrocks

Use of CEL, the CFX expression language, is covered in the CFX tutorials. You can download these from the ANSYS customer website.

Hi dear ghorrocks.
I know how can i create an expression. but I don't know that how i can set default domain->boundary details- > Mass and Momentum values.
In Normal speed, cart. Vel. components , ... we can type numbers only.

[Pyotr]

sohrabmajd,

before you enter de expression, you need to click the "alpha squared root" button, which is located beside the units drop-down menu.

[ghorrocks]

...... this is covered in the tutorials as well