Learning Forum

[mohamedobeid1412]

I'm trying to perform 2D analysis for a steady laminar incompressible flow through a horizontal channel with a height of H (m) and length of 2H. The boundary conditions is of the form:

$u=\frac{3}{2}U_{avg}\left(1-\frac{2y}{H}\right),v=0$ at $x=0$,

$\frac{\partial u}{\partial x}=0,\frac{\partial v}{\partial x}=0$ at $x=2H$,

with no-slip condition at the walls. Is it possible to implement these boundary conditions in Fluent? I think that UDF may help but I have no experience dealing with it. Thanks in advance, I will appreciate any help.

[Rob]

Almost certainly, either with an Expression or DEFINE_PROFILE.  The editor turned your equation into gibberish, please post an image. 

[mohamedobeid1412]

Thanks for your response. I have tried to make an expression but I'm not sure how these equations can be written as a Fluent input. Here is an image for the compiled Latex

[Rob]

OK, so u is the normal velocity, Uavg would be a fixed value, along with H? y is the y-coordinate? 

I suspect this covers what you need think about  https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v232/en/flu_udf/flu_udf_DetailedExampleUDFs.html%23flu_udf_udf_bc_appl   but Expressions https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v232/en/flu_ug/flu_ug_expressions.html may be better for a new user.  To access the links, open Help from Fluent and then copy the links into the browser that opens. 

[mohamedobeid1412]

Thank you so much, that is exactly what I was looking for. Also, I didn't know about the help guid of Fluent. I really appreciate it.

[Rob]

You're welcome.  You may also want to review the materials under Learning - book icon left side upper on here.