[GPDZ]

hi all,
I am new in this forum and I am a new user of OpenFoam. I have to study a isentropic, adiabatic subsonic flow in a tube convergent-divergent, given an inlet pressure and outlet pressure.
I have already done the mesh with gmesh. the problem is that I don't know which solver to use and if the mesh is correct.
please if somebody has already done this could explain it to me ??
i know it's a really trivial problem for those who deal with OF daily so I'm sure you can help me out in few seconds just telling me what to do.
many thanks in advance.
GP

[RodriguezFatz]

Hey,
Is this steady-state, uncompressible and turbulent?

[GPDZ]

yes it is. really simple I guess, but for me it is not!

[RodriguezFatz]

You can find a list of solvers here:
http://www.openfoam.org/features/standard-solvers.php

With the things you wrote here, you could use simpleFOAM.

[GPDZ]

ok thanx, but what shall i do to use simplefoam?

[RodriguezFatz]

You can find some examples how to configure the solver in the tutorial folder (OpenFOAM.../turotirals/incompressible/simpleFOAM).
I guess you need to read and try a bit with those tutorials and then ask some more explicit questions about the problems you face.

[GPDZ]

Originally Posted by RodriguezFatz

You can find some examples how to configure the solver in the tutorial folder (OpenFOAM.../turotirals/incompressible/simpleFOAM).
I guess you need to read and try a bit with those tutorials and then ask some more explicit questions about the problems you face.

i have tried to run the tutorial of simplefoam but when i digit blockmesh it says that the foam fails because in the controldict it is referred to an external library!! I have no idea of how to handle this!!

[RodriguezFatz]

Which tutorial?

[GPDZ]

Originally Posted by RodriguezFatz

Which tutorial?

pipeCyclic

[RodriguezFatz]

Don't you have an "Allrun" script in the tutorial? You can just start that, or have a look inside for the missing command.

[GPDZ]

this is the allrun script.yet, i don't know how to run it and what does it do?
thank you very much for your patience and kindness

[GPDZ]

Originally Posted by GPDZ

this is the allrun script.yet, i don't know how to run it and what does it do?
thank you very much for your patience and kindness

#!/bin/sh
cd ${0%/*} || exit 1 # run from this directory
# Source tutorial run functions
. $WM_PROJECT_DIR/bin/tools/RunFunctions
# Get application directory
application=`getApplication`
# This case uses the #codeStream which is disabled by default. Enable for
# just this case.
MAIN_CONTROL_DICT=`foamEtcFile controlDict`
if [ -f "$MAIN_CONTROL_DICT" ]
then
echo "Modifying ${MAIN_CONTROL_DICT} to enable allowSystemOperations"
# Clean up on termination and on Ctrl-C
trap 'mv ${MAIN_CONTROL_DICT}.$$ ${MAIN_CONTROL_DICT} 2>/dev/null; exit 0' \
EXIT TERM INT
cp ${MAIN_CONTROL_DICT} ${MAIN_CONTROL_DICT}.$$
echo "Enabling allowSystemOperations in ${MAIN_CONTROL_DICT}."
sed \
-e s/"\(allowSystemOperations[ \t]*\)\([0-9]\);"/"\1 1;"/g \
${MAIN_CONTROL_DICT}.$$ > ${MAIN_CONTROL_DICT}
fi

runApplication blockMesh
runApplication topoSet
runApplication refineHexMesh c0 -overwrite
cp -r 0.org 0
#runApplication $application
runApplication decomposePar -cellDist
runParallel $application 5
runApplication reconstructPar
# ----------------------------------------------------------------- end-of-file

[GPDZ]

so... what is the solution? how shall I run an Allrun script? and what does it do? and how do I study the flow in a channel with an already done mesh(I have done a mesh with Gmesh, the shape is a convergent-divergent and I have done 3 boundaries: inlet, outlet and side walls). Please help me out guys!!

[thg]

maybe you post your case here?!

you execute the Allrun script with

./Allrun

it makes in pricipal

i) the mesh i.e. runApplication blockMesh
ii) generate some regions/cellSets runApplication topoSet
iii) refines this regions runApplication refineHexMesh c0 -overwrite
iv) copy the inital value folder 0 i.e. cp -r 0.org 0
v) runs the solver in parallel
(the name of the solver is read with getApplication from the
controlDict entry...)
runApplication decomposePar -cellDist
runParallel $application 5
vi) reconstruct the paralel case runApplication reconstructPar


That's it.

thg.