[Nek5000-users] Traction BC

[nek5000-users at lists.mcs.anl.gov]

Dear Neks,


I have modified the turbChannel example (available in v17.0) to a WRLES 
flat plate test case and validated it against DNS data.

One step further, I am now imposing traction boundary condition on the 
wall, i.e tauw (TRX,TRZ) and computing the wall shear stress thanks to 
torque_calc routine. The computed wall shear stress corresponds to the 
one I am imposing. However the fluid accelerates at the wall and never 
converges to a value.


1. The wall shear stress in correct but the velocity increases over 
time. How can this be possible ?

2. Are you aware of the formalism surrounding traction boundary 
condition in the discrete equations ?


Sincerely,

Armand.

-- 
*Armand Shams*
Master Thesis Intern
Département aérodynamique, aéroélasticité, acoustique
MSAT
Tél: +33 6 99 51 15 84


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