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Hello Stan,

I'm grateful for your response. I'm sorry, but I'm new at using Nektar. For me, it doesn't matter which axis the channel spins on as long as it does it from the channel's face. I thought that Nektar only offers the option of rotation about the z axis. Is that correct? I.e., can I rotate the channel around any axis I want? 

Or can I just insert velocity values for the channel wall instead of using the "forcing" option and all of its requirements? I mean like this

 <REGION REF="0">
       <D VAR="u" VALUE="-2.0*y"/>
       <D VAR="v" VALUE="2.0*(x-0.4)"/>
       <D VAR="T" VALUE="1600"/>
       <N VAR="p" USERDEFINEDTYPE="H" VALUE="0"/>
        </REGION>

In addition, according to your suggestion, can making a homogeneous (Fourier) expansion result in a 3D mesh with a high computational cost? I want to know whether there is a difference in computation time between quasi-3D and normal 3D so that I can just create a 3D model using Gmesh and convert it to Nektar.

Thank you in advance,

Ali 

University of Kerbala

website  :  https://uokerbala.edu.iq/en/
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