For the past weeks I've been testing nektar for incompressible jets and so far I've been able to compile the code on our cluster and to run some simulations with it too. However, I still have a few questions:
A) What is the best way to compute the Reynolds stresses in cylindrical coordinates? In jets, it is common to plot the stresses only as function of the radial coordinate and to average azimuthally (like in pipes). Can the stresses be computed in cylindrical coordinates run time or do I have to save snapshots of 3D-fields to disk and do everything in a post processing step?
B) How do I restart a simulation? So far I haven't succeeded with the following approach:
-Run simulation for some time to produce jet.fld.
-FieldConvert base/jet.xml base/jet.fld restart.fld
-mv restart.fld base/restart.rst
-Set initial conditions to:
<FUNCTION NAME="InitialConditions">
<F VAR="u,v,w,p" FILE="restart.rst" />
</FUNCTION>
-IncNavierStokesSolver base/mesh.xml base/jet.xml (the mesh is in separate .xml file)
-->Unable to open file: restart.rst
C) What is the difference between .chk and .fld? I have a hunch that the .chk files could be used to restart the simulation with much less effort...
Petteri Peltonen, (M.Sc.)
Aalto University, School of Engineering
Department of Mechanical Engineering
PO Box 14300
FI-00076 Aalto, Finland
+358 44 0554984
petteri.peltonen(a)aalto.fi