# Step 1 (Geometry creation):
- Import the .stl file of spaceship
- Once you have that make sure the triangles are small
- Use gmsh in case that the triangles are too big and save with new geometry
- After this run:
gmsh meshSTEP.geo

- This will create the new STL file we will use for our simulation
- Copy it inside the triSurface directory
cp -r shuttle.stl constant/triSurface/

- After this run the surfaceFeatures command to get the new eMesh file needed:
surfaceFeatures

- Check that the dimensions of the box are correct so run blockMesh and look at the stl file.
blockMesh 

- For this keep going until everything is right, and fix the input output of the sim
- After this is done we can create the domain
blockMesh
checkMesh

- Once these two run with no problems we can start adding the stl mesh into it:
- (Suggestion here, first check the boxes are working with castellatedMesh set to true and all else false)
- (After this one is done and it works set snap also to true, but keep layers false! We are not doing viscous)
snappyHexMesh -overwrite 

- After this runs look inside the 0 directory, if there are files that are not T, U, p erase them
rm -r 0/"Name of file"




# Step 2 (Simulation):
- Once all else is done we can start the simulation on multiple cores (change the number in system/decomposeParDict):
- (If ran locally)
decomposePar
mpirun -np 8 rhoCentralFoam -parallel

- Once the simulation is over you have to reconstruct it:
reconstructPar

# NOW YOUR SIMULATION IS READY TO BE LOOKED IN PARAVIEW!