Hi Syavash

You could use FieldConvert’s WSS module. For instance, if the wall boundary ID is 0, 

FieldConvert -m wss:bnd=0 <mesh.xml> <session.xml> <time-averaged.fld> <time-averaged-wss.fld>

 

The output fld will either be a 1D/2D field of wss values on the boundary ID for a 2D/3D flow field. 

If you wish to compute mean of the wss, you can use FieldConvert -m mean with the appropriate 1D/2D mesh file of the boundary obtained using Nekmesh -m extract. Hope this helps

Cheers

Chi Hin

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From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ehsan Asgari <eh.asgari@gmail.com>
Sent: Tuesday, June 6, 2023 8:07:43 AM
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] Calculating time-averaged wall shear stress

 

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Dear All,

I have a time-averaged field, say "time-average.fld". How should I proceed to calculate time-averaged wall shear stress? I was wondering if I need to use "wss" first.

Kind regards

syavash