Step by step guide to use HiFUN
Prerequisite: A familiarity with setting environment variables in bash shell is expected
Step 1: Setting the environment variables
source /home/pkg/lic/HiFun/hifun-3.1.1/hifunrc_open64_openmpi133
Step 2: Using HiFUN’s GUI for preprocessing grid data
This is a serial mode execution.
User can use any Linux based workstation with sufficient memory (RAM) and disk space, to preprocess grid data.
Execute following command from terminal command prompt:
hifun
Follow the instructions displayed on GUI to input relevant information.
Once preprocessing is over, user can transfer data to TYRONE cluster and start his parallel job using HiFUN.
Step 3: To submit solver job in parallel using PBS script on Tyrone
Download sample Job submission file.
Job submission file for executable compiled using gfortran-4.6.0 and openmpi-1.3.3
Job submission file for executable compiled using open64-5.0 and openmpi-1.3.3
Modify ‘Job name’ and values of ‘ppn’ and ‘nodes’ depending on your requirement.
Basic Procedure/Steps to execute HiFUN SOLVER
- Go to directory <project_dir>/<*_RUN>
- In directory “Subdomains”, make sure that all the SUBDOMAIN.* files are unzipped. If not, unzip them using following command:
gunzip -rv Subdomains/SUBDOMAIN.*.gz
- Edit job submission file to change following parameters:
number of nodes: “select=<number of nodes>”
number of processes: “-np <number of processess>”
- Run the solver in <*_RUN> directory using following command:
qsub submit.job
- For checking job status qstat
- For killing the job qdel -W force <jobid>
- To monitor the job tail -f residue.dat
- To look for errors tail output
- To plot residue files gnuplot
Input files for HiFUN solver in directory *_RUN/Flowsolver_input
Following is the brief description of files present in directory Flowsolver_input:
- automatic_cfl_ramping.inp: Enables to automatically increase the CFL multiplying factor. If available, this file overrides the CFL multiplying factor value set.
Format:
Number of lines
Start iteration, End iteration, CFL multiplying factor (For number of lines)
- boundary_information.inp: Set data pertaining to wall, pressure inlet, pressure outlet and fluid Zones.
- freestream.inp: Set the free stream parameters and reference parameters.
- halt.inp: Set the halt option for halting the solver run.
- lift_drag_contrib.inp: Set contribution of wall boundaries to global force and moment coeffs.
- run_option.inp: Set whether grid data read is serial or parallel.
- userchoice.inp: Set the flow solver input parameters.
Files Generated by HiFUN SOLVER
Files required for postprocessor:
restart*.dat : Restart files storing data storing for all the subdomains
restartbak*.dat : Restart (backup) files storing solution data for
subdomains
wall*.dat : Files containing wall data for subdomains
Files of immediate interest to user:
force_coefficients.dat: Contains as many lines as the number of walls in the grid data.
Format of line i:
wall_index Cx_pressure, Cx_viscous, Cx,
Cy_pressure, Cy_viscous, Cy,
Cz_pressure, Cz_viscous, Cz,
CMx_pressure, CMx_viscous, CMx,
CMy_pressure, CMy_viscous, CMy,
CMz_pressure, CMz_viscous, Cmz
info.usr: Some information about solver setting and free stream condition.
Iter_eq_1_residue.dat: Relative residue for conserved and primitive variables at first iteration.
relative_residue.dat: Relative residue for conserved and primitive variables
Format:
Iter_no, density (residue), x-momentum, y-momentum, z-momentum, energy,
pressure, u-velocity, v-velocity, w-velocity, temperature
residue.dat:
Format:
Iter_no, density residue, CFL number, ignore, ignore,
modified turbulent viscosity residue, time per iteration in sec
total_force_moment_coeffs.dat: Force and moment coefficients for entire configuration.
Format:
iter_no, Cx_pressure, Cx_viscous, Cx,
Cy_pressure, Cy_viscous, Cy,
Cz_pressure, Cz_viscous, Cz,
CMx_pressure, CMx_viscous, CMx,
CMy_pressure, CMy_viscous, CMy,
CMz_pressure, CMz_viscous, CMz
Plotting the Convergence Histories
- Go to particular RUN directory and issue following command from command prompt:
- gnuplot
- To plot the residue:
plot ‘residue.dat’ u 1:2 w l,’residue.dat’ u 1:6 w l
