How to simulate †
To perform normal simulation †
- Obtain an appropriate sample UDF file for your purpose from our examples.
- Start "Gourmet" and open the UDF file. Modify it for your own purpose and save it as "input.udf".
- Run KAPSEL as follows. (remove "./" if you use Windows command prompt)
> ./kapsel -Iinput.udf -Ooutput.udf -Ddefine.udf -Rrestart.udf
- "-I" option defines the name of UDF file which contains details of simulation (type of simulation, initial conditions, physical and simulation parameters, etc...).
- "-O" option defines the name of UDF file which contains the results (time-dependent positions and velocities of all the particles, etc...) of the simulation.
- "-D" option defines the name of UDF file which contains definitions of KAPSEL data dormat. This is common for any simulations.
- "-R" option defines the name of UDF file which contains values of all dynamical variables at the end of the simulation See "Re-start run" below.
- Field data (fluid velocities, ionic densitied, etc...) is saved in a subdirectory specified in "input.udf" if "output.AVS" = "on". This requires huge disk space (GB order). No field data is saved if "output.AVS" = "off".
- Start "Gourmet" and open "output.udf".
- Instantaneous positions and velocities of all the particles can be seen as variables in "Particles[]". Use slide bar at the bottom of Gourmet window to see variables at different time steps.
- Load "plot.py" to plot time evolutions of the variables. (See STEP4)
- Load "particleshow.py" to visualize motions of particles. (See STEP4)
To re-start previous simulation †
- One can re-start simulations from the end of the previous run.
- Start "Gourmet", and open "restart.udf"
- Set "resume.Calculation" = "CONTINUE"
- Increase "output.Num_step", and save it as "input2.udf"
- Run KAPSEL as follows. (remove "./" if you use Windows command prompt)
> ./kapsel -Iinput2.udf -Ooutput2.udf -Ddefine.udf -Rrestart2.udf
To analyze simulation data †
- The history of simulation run (instantaneous positions and velocities of particles) is stored in "output.udf". One can access to this file by one of the following methods.
- Python program. Read the manual below.
- English: &ref(): File not found: "pythoninterface_eng.pdf" at page "Tutorial";
- Japanese: &ref(): File not found: "PythonInterface_jpn.pdf" at page "Tutorial";
- Fortran or C program with libplatform (library to access UDF). Read the manual below.
- English: &ref(): File not found: "libplatform_eng.pdf" at page "Install";
- Japanese: &ref(): File not found: "libplatform_jpn.pdf" at page "Install";
