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====OpenFOAM====

  * [[https://www.openfoam.com/|OpenFOAM]]

===Installing OpenFoam===
  * Installing OpenFoam requires the use of the Sudo command therefore system admin needs to perform the first 4 steps from [[https://openfoam.org/download/11-linux/]]. User needs to be added to Docker group also.

  * Ran OpenFOAM Docker image on Littlestorm. Following this procedure:

1) Edit your ~/.bashrc file and add the line: export XAUTHORITY=$HOME/.Xauthority

2) Start with "Step 5: Launching openfoam11-linux" at the following link [[https://openfoam.org/download/11-linux/]]  However, when you get to the last line that launches "openfoam11-linux" ,  you instead need to launch it like this: openfoam11-linux -p 510 -xhost  <--This will ensure that graphical programs get passed through and show up correctly when xforwarding.   You may not need the extra flags if you are using a VNC session.
  *Step 5 from link:

   mkdir -p $HOME/OpenFOAM/${USER}-11
   cd $HOME/OpenFOAM/${USER}-11
   openfoam11-linux -p 510 -xhost

3) Once in the container, return to [[https://openfoam.org/download/11-linux/]], and go to Step 6: Testing openfoam11-linux. This should ensure that everything is set correctly and afterward you should be ready to work with the program.
  *Step 6 from link:
    *Testing OpenFOAM

    mkdir -p $FOAM_RUN
    cd $FOAM_RUN
    cp -r $FOAM_TUTORIALS/incompressibleFluid/pitzDailySteady .
    cd pitzDailySteady
    blockMesh
    foamRun
    paraFoam

===Older Versions===
  *The [[https://develop.openfoam.com/Development/openfoam/-/wikis/precompiled/docker#running-openfoam-in-a- 
   container]] contains the latest version of the OpenFOAM docker image, it updates automatically on their website.
  *To install an older version go to [[https://openfoam.org/]] and type "Download v#" (# = preferred version). 
   Note: every different version will need to be installed by a system admin. 
   
==== Procedure ====
 1) Within the 'run' directory start openFOAM: openfoam11-linux -p 510 -xhost

 2) Navigate to the case directory.

 3) Run the blockMesh command, to create a simple 3-D cubic domain.
 
 4) Run the snappyHexMesh command, used to conform the volume mesh to the CAD model surface.
==== Issues ====
=== Problem (2024/09/24) ===
 * OpenFOAM NASA_P3_extendedPylon_CDP_OAP_v5.obj object files does not exist so model does execute.
=== Cause ===
 * .obj file missing from directory 0, in the NASA_extendedPylon_v2_tas120_aoa0_900T33.
=== Solution ===
 * Locate file and place in correct directory. 
==== Procedure ====
 * After successfully running snappyHexMesh, run checkMesh.
==== Issues ====
=== Problem (2024/09/24) ===
 * Max skewness = 6.02536, 39 highly skew faces detected which may impair the quality of the results
  <<Writing 39 skew faces to set skewFaces
    Coupled point location match (average 0) OK.

Failed 1 mesh checks.

=== Cause ===
 * maxBoundarySkewness set too high in the meshQualityDict.
=== Solution ===
 * Go to the System directory in the case directory. Open and edit the meshQualityDict to include the lines below 
 “minFaceWeight 0.02; 		// Already in your file, leave as is.”
// Existing inclusion of defaults 
#includeEtc "caseDicts/mesh/generation/meshQualityDict" 
// Overriding critical parameters 
minFaceWeight 0.02; 		// Already in your file, leave as is. 
maxNonOrtho 65; 		// Slightly above your max value of 64.99.
maxBoundarySkewness 4.5;	// Reduce from default (typically 20). 
maxInternalSkewness 4.5; 	// Reduce from default. 
maxAspectRatio 10;		// Reduce from current 21.34 if necessary. 
minVol 1e-8; 			// Prevents extremely small cells. 
minTetQuality 1e-6;		 // Ensures tetrahedral elements are valid.
==== Procedure ==== 
 5) After updating the meshQualityDict, run checkMesh command again
==== Issues ====
=== Problem (2024/09/24) ===
 * OpenFOAM NASA_P3_extendedPylon_CDP_OAP_v5.obj object files does not exist so model does execute.
=== Cause ===
 * .obj file missing from directory 0, in the NASA_extendedPylon_v2_tas120_aoa0_900T33.
=== Solution ===
 * Locate file and place in correct directory. 
==== Procedure ====
 6) After successfully running snappyHexMesh, run checkMesh.
==== Issues ====
=== Problem (2024/09/24) ===
 * Max skewness = 4.49813, 42 highly skew faces detected which may impair the quality of the results
  <<Writing 42 skew faces to set skewFaces
    Coupled point location match (average 0) OK.

=== Cause ===
 * maxBoundarySkewness still set too high in the meshQualityDict.
=== Solution ===
 * Go to the System directory in the case directory. Open and edit the meshQualityDict to include the lines below 
 “minFaceWeight 0.02; 		// Already in the file, leave as is.”
// Existing inclusion of defaults 
#includeEtc "caseDicts/mesh/generation/meshQualityDict" 
// Overriding critical parameters 
minFaceWeight 0.05; 		// Already in your file, leave as is. 
maxNonOrtho 65; 		// Slightly above your max value of 64.99.
maxBoundarySkewness 4.0;	// Reduce from default (typically 20). 
maxInternalSkewness 4.0; 	// Reduce from default. 
maxAspectRatio 5;		// Reduce from current 21.34 if necessary. 
minVol 1e-8; 			// Prevents extremely small cells. 
minTetQuality 1e-6;		 // Ensures tetrahedral elements are valid.
==== Procedure ====
 7) Run checkMesh.

 8) Update the 0 directory to match the new mesh size and to set the desired boundary conditions.

 9) Use decomposePar to run breakup the simulation into multiple cores.

 10) Run the rhoSimpleFoam solver.