March 2018 - Nektar-users - imperial.ac.uk

initial condition for Turb_Channel Flow
by Mahdi Kooshkbaghi 13 Mar '18

13 Mar '18

Dear all, Is there any .rst file available for the initial condition of turbulent channel flow? I want to do DNS with Re_tua = 180 or 395 or 590. Those of benchmarks in MKM paper (https://doi.org/10.1063/1.869966) Best, Mahdi

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Stability analysis of compressible flow
by devabratasahoo＠campus.technion.ac.il 11 Mar '18

11 Mar '18

Dear all, I would like to know if it is possible to use Nektar++ to analyze the stability of a compressible flow. To best of my knowledge, the functionality was unavailable as Nektar doesn't have an implementation of the linearised compressible NS equations. But, I would like to know if there is any development regarding this. Regards, Devabrata Sahoo

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Problem in Robin BC in 3D1H case
by Asım Önder 08 Mar '18

08 Mar '18

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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