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Dear All,
How can I average the solutions of planes across the homogenous direction
in a Quasi 3-D simulation?
Kind regards
syavash
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Hello Nektar Community,
I am running a full 3D DNS simulation at Re=400 of a flow past a rectangular prism using the incompressible solver. This flow is laminar but 3D effects are present. I am using a structured mesh generated using gmsh with a p order of 4 which comes to roughly 2.6 million degrees of freedom. A colleague is able to run a similar but slightly more complex DNS simulation at Re=3900 on 1/8 the number of processors and he still obtains results much faster. All signs indicate I should be able to use far fewer resources than I currently am, but neither of us can figure out how to optimise further than I already have. I followed the optimisation section of the Nektar user guide, tweaked my mesh several times, changed the time step size, etc., but all of these adjustments showed marginal improvements at best. I would be very grateful if anyone has any suggestions. I am providing my case files here: https://drive.google.com/drive/folders/1iT0GvZgE0MyfmjNe1GYMlAKJp-8fh57X?us… the slurm file called P4.sh has the script I normally use on clusters.
I look forward to hearing from you!
All the best,
Isaac
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TCS Confidential
Dear support team
I am working with TCS research and trying to model liquid metal batteries. Can Nektar++ be used to model electro vortex flows arising due to interaction with current carrying conductors?
Regards
Murali
TCS Confidential
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Dear Users,
I'm trying to implement some new Nektar++ solvers for various fluid
equations (derived from plasma physics).
Let's say I have a pair of discontinuous Galerkin fields (n & omega). I've
got an advection velocity, which works fine in the API for advecting
stuff. But I also want a term in the RHS of n_dot (where _dot means d/dt)
and omega_dot which is proportional to d^2 n / dz^2.
I can easily evaluate this term in the ExplicitTimeInt method but I think I
need to do something to modify the numerical fluxes as well. I think this
is done in the GetFluxVector method, so I went into that and modified the
output (basically adding something like (0, 0, dn/dz) into the flux so when
the div is taken, there is the second derivative).
The question is whether this is the right thing to do to get this system
working correctly. Will it work and are there likely to be problems (e.g.
will it upwind correctly, as the resulting code seems to have poor
stability).
Sorry for what might seem a bit of an obscure question, I can supply more
details if it helps.
Thanks,
Ed.