Plotfiles and other output

The following inputs must be preceded by the prefix mfix and control frequency and naming of plotfile generation.

	Description	Type	Default
plot_file	Prefix to use for plotfile output.	String	plt
file_digits	Number of digits to use in plotfile (plt[0-9]+) and checkpoint (chk[0-9]+) filenames.	Int	5
plot_int	Plotting interval in timesteps (0 to disable).	Int	0
plot_per_approx	Approximate plotting interval in simulation time (does not modify dt). 0 to disable. Only one of plot_int or plot_per_approx may be specified.	Real	0
plot_on_restart	Write a plotfile when restarting (only used if plot_int>0).	Bool	false

The following inputs must be preceded by the prefix mfix and control which variables will be written in plotfiles.

	Description	Type	Default
plt_regtest	Plot all variables (overrides all other plot flags).	Int	0
plt_drag_p	Plot particle drag force.	Int	0
plt_ep_g	Plot fluid volume fraction.	Int	1
plt_gradp_g	Plot fluid pressure gradient.	Int	0
plt_mu_g	Plot fluid molecular viscosity.	Int	0
plt_omega_p	Plot particle angular velocity.	Int	0
plt_p_g	Plot fluid pressure.	Int	0
plt_phase	Plot particle type.	Int	0
plt_radius	Plot particle radius.	Int	0
plt_ro_g	Plot fluid density.	Int	0
plt_ro_p	Plot particle density.	Int	0
plt_statwt	Plot particle (parcel) statistical weight.	Int	0
plt_T_g	Plot fluid temperature.	Int	0
plt_T_p	Plot particle temperature.	Int	0
plt_vel_g	Plot fluid velocity data.	Int	1
plt_vel_p	Plot particle velocity.	Int	1
plt_volfrac	Plot Eulerian grid volume fraction (from cut cells).	Int	0
plt_vort	Plot fluid vorticity.	Int	0

The following inputs must be preceded by the prefix mfix.solids and allow to write additional plotfiles which contain only solids variables in specific regions at fixed timesteps or approximated simulation times.

	Description	Type	Default
regions	Specify regions that will be used for plotfiles.	Strings
[region_name]	Specify which solids phases will be plotted.	Strings
[region_name].plot_int	Plotting interval in timesteps (0 to disable).	Int	0
[region_name].plot_per_approx	Approximate plotting interval in simulation time (does not modify dt). 0 to disable. Only one of plot_int or plot_per_approx may be specified.	Real	0
[region_name].plt_regtest	Plot all variables (overrides all other plot flags).	Int	0
[region_name].plt_cp_s	Plot particle specific heat coefficient.	Int	0
[region_name].plt_drag_p	Plot particle drag force.	Int	0
[region_name].plt_h_s_txfr	Plot particle interphase enthalpy transfer.	Int	0
[region_name].plt_mass	Plot particle mass.	Int	0
[region_name].plt_mass_sn_txfr	Plot particle interphase mass transfer.	Int	0
[region_name].plt_omega_p	Plot particle angular velocity.	Int	0
[region_name].plt_omoi	Plot particle inverse momentum of inertia.	Int	0
[region_name].plt_phase	Plot particle phase.	Int	0
[region_name].plt_radius	Plot particle radius.	Int	0
[region_name].plt_ro_p	Plot particle density.	Int	0
[region_name].plt_statwt	Plot particle statistical weight.	Int	0
[region_name].plt_T_p	Plot particle temperature.	Int	0
[region_name].plt_vel_p	Plot particle velocity.	Int	0
[region_name].plt_vel_s_txfr	Plot particle interphase velocity transfer.	Int	0
[region_name].plt_volume	Plot particle volume.	Int	0
[region_name].plt_X_s	Plot particle species mass fractions.	Int	0

Files will be saved to a directory [region_name] using the plot_file prefix, e.g. region1/plt00000

Below is an example for specifying the inputs to plot solids data in a given region.

mfix.solids.regions = my_region

mfix.solids.my_region.plot_int = 10
mfix.solids.my_region.plt_vel_p = 1

Debugging

The following inputs control whether particle data should be written out in ASCII format. They must be preceded by the prefix mfix.

	Description	Type	Default
par_ascii_file	Prefix to use for ASCII particle output file name.	String	par
par_ascii_int	ASCII particle output interval in timesteps. 0 to disable.	Int	0
par_ascii_per_approx	Approximate simulation time period for ASCII particle output. 0 to disable. Only one of par_ascii_int or par_ascii_per_approx may be specified.	Real	0

The following inputs control whether the EB geometry or level set should be written. They must be preceded by the prefix mfix.

	Description	Type	Default
write_ls	Write a plotfile containing the level set and volume fraction. If enabled, it will only be written once, after initialization or restart.	Bool	false
write_eb_surface	Write the EB geometry in VTP format. If enabled, it will only be written once, after initialization or restart.	Bool	false
write_geom	Write a plotfile containing the EB geometry data. If true, it will only be written once, after initialization or restart.	Bool	false

Ascent has been integrated into MFIX-Exa for in situ visualization. See Ascent for details.