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Dear Stan,

 Thank you again for your reply. Exactly, I wanted to rotate the channel by applying body forcing. I found only two ways to do that in Nektar:
1.  Time-dependent mapping of coordinates,
2, add a MovingReferenceFrame body force and solve the absolute velocity in the body frame. However, neither is helpful for me. If I use " VCSMapping", the temperature will not work for me. If I select "MovingReferenceFrame", y_axis rotation will not work for me either. I still don't want to go for Qusi-3D or 3D simulations, can I modify something in " VCSMapping" scheme to include temperature?

I really appreciate your help,

Best,

Ali

PS: I am attaching the files that I am dealing with. 

‪On Thu, Feb 9, 2023 at 9:32 PM ‫Ali Ahmed Abdulrasool - علي احمد عبد الرسول‬‎ <ali.abdulrasool@uokerbala.edu.iq> wrote:‬

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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