[Nektar-users] Problem in Robin BC in 3D1H case

[Asım Önder]

Dear all,

in a 3D turbulent channel flow simulation with Fourier expansions in one
direction, I want to add some small wall imperfections using Robin boundary
conditions. To this end, I specified the following simple cos disturbances
into wall boundary:

 <R VAR="u"  VALUE="0"
PRIMCOEFF="(pertAmp*cos(2.0*PI/LZ*2*z+2.0*PI/LX*4*x))^(-1)"/>
 <R VAR="v"  VALUE="0"
PRIMCOEFF="(pertAmp*cos(2.0*PI/LZ*2*z+2.0*PI/LX*4*x))^(-1)"/>
 <R VAR="w"  VALUE="0"
PRIMCOEFF="(pertAmp*cos(2.0*PI/LZ*2*z+2.0*PI/LX*4*x))^(-1)"/>

When I checked the data, it seems like the terms multiplied by z remains
alway zero while x-related terms have no problem. In this regard, I was
wondering whether 3D1H case does support functional expansions in the
Fourier direction for Robin BC.

Any feedback would be appreciated.

Thanks,
Asim
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