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Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 1
Assignment1
CASE1: CAVITY
• Generate the mesh by typing blockMesh
• Run the cavity case by typing
icoFoam >& log & in the case folder
• Start post-processing by typing paraFoamin the case-folder
• Apply to load the default items and set up
the visualisation properties
• Here, I used surface+edges, switched to
the last timestep and changed the colour-
ing with red representing the maximum
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 2
Assignment1
Martin Gramlich
CASE2: CAVITYFINE
• Copy the folder cavity to cavityFine
• Adapt the mesh resolution and generate
the mesh by typing blockMesh
• Adapt the following settings in the
controlDict (startTime: 0.5; endTime:0.7; deltaT: 0.0025; writeControl: run-
Time; writeInterval: 0.1;) and run the case
by typing icoFoam >& log& in the casefolder
• Start post-processing by typing paraFoamin the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 3
Assignment1
Martin Gramlich
CASE3: CAVITYGRADE
• Copy the folder cavityGrade from the
tutorials-folder of OpenFOAM
• Check the grade of the mesh in the
blockMeshDict and run blockMesh af-terwards
• Adapt the settings in the controlDict(startTime: 0.7; endTime: 0.8; deltaT:
0.0025; writeControl: timeStep; writeIn-
terval: 40;) to get a courant number less
then 1 and run the cavity case by typing
icoFoam in the case folder
• Start post-processing by typing paraFoamin the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 4
Assignment1
Martin Gramlich
CASE4 - A): CAVITYHIGHRE
CASE: CAVITY CASE: CAVITYHIGHRE
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 5
Assignment1
Martin Gramlich
CASE4 - B): CAVITYHIGHRE
• Copy the folder cavity to cavityHighRe
• Decrease nu by factor 100 in the file transportProperties to increase Re bythe same factor
• Adapt the settings in the controlDict (startTime: latestTime; endTime: 8; write-
Control: runTime; writeInterval: 1;) and run the cavity case by typing icoFoamin the case folder
• Check in the log file if convergence is achieved for p and U
• Start post-processing by typing paraFoam in the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 6
Assignment1
Martin Gramlich
CASE5 - A): CAVITYRAS
CASE: CAVITY CASE: CAVITYRAS
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 7
Assignment1
Martin Gramlich
CASE5 - B): CAVITYRAS
• Copy the folder cavity from $FOAM_TUTORIALS/incompressible/pisoFoam/to $FOAM_RUN/cavityRAS/
• Generate the mesh running blockMesh
• Check the settings in the k-file, epsilon-file, transportProperties-file,controlDict and the RASProperties-file
• Adapt the settings in the controlDict (startTime: latestTime; endTime: 20; deltaT:
0.02; writeControl: runTime; writeInterval: 2;) and run the cavityRAS case by
typing pisoFoam in the case folder
• Start post-processing by typing paraFoam in the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 8
Assignment1
Martin Gramlich
CASE6 - A): CAVITYCLIPPED
TIMESTEP: 0.5 TIMESTEP: 0.6
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 9
Assignment1
Martin Gramlich
CASE6 - B): CAVITYCLIPPED
• Copy the folder cavityClipped from $FOAM_TUTORIALS/incompressible/icoFoam/to $FOAM_RUN/
• Generate the mesh running blockMesh
• Copy the folder 0/ to 0.5/
• Check the patches for the boundary values
• Run mapFields ../cavity/ in the cavityClipped-folder and change theboundary values for the fixedWalls in the U-field to uniform (0 0 0);
• Start post-processing by typing paraFoam in the case-folder
• To visualize the Outline of cavityClipped, load the needed patches and add them
to the ”Extract Blocks”-filter
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 10
Assignment1
Martin Gramlich
CASE7 - A): DAMBREAK
TIMESTEP: 0.5 TIMESTEP: 0.6
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 11
Assignment1
Martin Gramlich
CASE7 - B): DAMBREAK
• Copy the folder damBreak from $FOAM_TUTORIALS/multiphase/interFoam/laminar/to $FOAM_RUN/
• Generate the mesh running blockMesh
• Copy 0/alpha1.org to alpha1 and excute setFields, to set the non-uniform,initial conditions for the phase fraction
• Run the simulation by typing interFoam >& log & in the case-folder
• Start post-processing by typing paraFoam in the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 12
Assignment1
Martin Gramlich
CASE8 - A): DAMBREAKFINE
TIMESTEP: 0.5 TIMESTEP: 0.6
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 13
Assignment1
Martin Gramlich
CASE8 - B): DAMBREAKFINE
• Create the directory damBreakFine in $FOAM_RUN
• Copy the folders 0/, constant/ and system/ from $FOAM_RUN/damBreak/to $FOAM_RUN/damBreakFine/
• Adapt the mesh by changing the following values in the blockMeshDicthex (0 1 5 4 12 13 17 16) (46 10 1) simpleGrading (1 1 1)
hex (2 3 7 6 14 15 19 18) (40 10 1) simpleGrading (1 1 1)
hex (4 5 9 8 16 17 21 20) (46 76 1) simpleGrading (1 2 1)
hex (5 6 10 9 17 18 22 21) (4 76 1) simpleGrading (1 2 1)
hex (6 7 11 10 18 19 23 22) (40 76 1) simpleGrading (1 2 1)
• Generate the mesh running blockMesh
• Copy 0/alpha1.org to alpha1 and excute setFields, to set the non-uniform,initial conditions for the phase fraction
• To run the simulation using parallel calculation: Decompose the domain by typ-
ing decomposePar in the case+folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 14
Assignment1
Martin Gramlich
CASE8 - C): DAMBREAKFINE
• Run the simulation by typing mpirun -np 4 interFoam -parallel >& log &in the case-folder
• Reconstruct the seperated results by typing reconstructPar in the case-folder
• Start post-processing by typing paraFoam in the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 15
Assignment1
Martin Gramlich
CASE9 - A): PITZDAILY
ITERATION: 50 ITERATION: 1000
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 16
Assignment1
Martin Gramlich
CASE9 - B): PITZDAILY
• Copy the folder pitzDaily from $FOAM_TUTORIALS/incompressible/simpleFoam/to $FOAM_RUN/
• Generate the mesh running blockMesh
• Start the simulation by typing simpleFoam >& log & in the case-folder
• Start post-processing by typing paraFoam in the case-folder
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 17
Assignment1
Martin Gramlich
FUNCTIONOBJECT1- A): MASSFLOW
• The massFlow-functionObject calculates the flux through a patch selected by the
user
• It works in OpenFOAM-1.6ext, and should also work in OpenFOAM-1.5dev
• To use the massFlow-functionObject, add the following lines to the controlDict-file in the system-folder
• function{massFlow{type patchMassFlow;functionObjectLibs ("libsimpleFunctionObjects.so");verbose true;patches (inlet outlet);factor 1;}};
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 18
Assignment1
Martin Gramlich
FUNCTIONOBJECT1 - B): MASSFLOW
• In the code-lines, the following settings can be applied:
"type" defines the type of massFlow that should be calculated
"functionObjectLibs" loads the necessary library for the functionObject"verbose" defines, how the results should be written out
"patches" defines the patches, where the massFlow should be calculated"factor" defines the factor, the result should be multiplied with
• Before the massFlow-functionObject can be applied, the library ”libsimpleFunc-
tionObjects.so” must be available in the libraries-folder of OpenFOAM
• If that file is not installed yet, create the folder $WM_PROJECT_USER_DIR/libraries/and checkout the simpleFunctionObjects-libraries by typing the following line in
that folder svn checkout https://openfoam-extend.svn.sourceforge.net/ \svnroot/openfoam-extend/trunk/Breeder_1.6/libraries/ \simpleFunctionObjects
• For the OpenFOAM-Version 1.5dev change "/Breeder_1.6/" to "/Breeder_1.5/"
Hakan Nilsson, Chalmers / Applied Mechanics / Fluid Dynamics 19
Assignment1
Martin Gramlich
FUNCTIONOBJECT1 - C): MASSFLOW
• After checking out the simpleFunctionObjects, go into that folder and type wmake libsoto create the simpleFunctionObjects-libraries
• The file ”libsimpleFuntionObjects.so” should be now available in the libraries-
folder of the OpenFOAM-installation
• Once the necessary library-file is available, the solver can be started by typing
simpleFoam >& log & in the case-folder
• The solver will then create a directory patchMassFlows_massFlow/0/ in thecase directory
• In this directory the massflow-field will be stored in the file massFlow
• The data-field can be viewed by opening the with an text-editor, i.e. the vi editor
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