Plotfiles and Other Output

The following inputs must be preceded by “mfix.” and control frequency and naming of plotfile generation as well as whether the EB geometry or level set should be written out, and if the particles should be written out in Ascii format (for debugging).

	Description	Type	Default
plot_int	Frequency of plotfile output; if -1 then no plotfiles will be written at this frequency	Int	-1
plot_per_approx	Time period of plotfile output (approximate); does not modify dt if -1 then no plotfiles will be written at this frequency	Real	-1
plotfile_on_restart	Should we write a plotfile when we restart (only used if plot_int>0)	Bool	False
plot_file	Prefix to use for plotfile output	String	plt
par_ascii_file	Prefix to use for ascii particle output	String	par
par_ascii_int	Frequency of ascii particle output; if -1 then no particle ascii files will be written	Int	-1
par_ascii_per_approx	Time period of the ascii particle output (approximate); if -1 then particle ascii files will not be written at this frequency	Real	-1
ascent_int	Frequency of ascent pipeline; if -1 then ascent will not be called.	Int	-1
ascent_per_approx	Time period of the ascent pipeline (approximate); if -1 then ascent will not be called.	Real	-1

The following inputs must be preceded by “mfix.” and control what variables will be written in plotfiles.

	Description	Type	Default
plt_regtest	Save all variables to plot file (overrides all other IO flags)	Int	0
plt_vel_g	Save fluid velocity data to plot file	Int	1
plt_ep_g	Save fluid volume fraction to plot file	Int	1
plt_p_g	Save fluid pressure to plot file	Int	0
plt_ro_g	Save fluid density to plot file	Int	0
plt_mu_g	Save fluid viscosity to plot file	Int	0
plt_diveu	Save div(ep_g . u) to plot file	Int	0
plt_volfrac	Save Eulerian grid volume fraction (from cut cells) to plot file	Int	0
plt_gradp_g	Save gradient of pressure filed to plot file	Int	0
plt_vort	Save vorticity to plot file	Int	0
plt_vel_p	Save particle velocity to plot file	Int	1
plt_radius	Save particle radius to plot file	Int	0
plt_volume	Save particle volume to plot file	Int	0
plt_volume	Save particle volume to plot file	Int	0
plt_mass	Save particle mass to plot file	Int	0
plt_ro_p	Save particle density to plot file	Int	0
plt_omoi	Save (one divided by the) particle momentum of inertia to plot file	Int	0
plt_mass	Save particle mass to plot file	Int	0
plt_omega_p	Save particle angular velocity to plot file	Int	0
plt_drag_p	Save particle drag force to plot file	Int	0
plt_phase	Save particle type to plot file	Int	0

The following inputs must be preceded by “mfix.” and control whether the EB geometry or level set should be written out.

	Description	Type	Default
write_ls	Should we write a plotfile holding the level set and volfrac? If true, it will only be written once,after initialization or restart	Bool	False
write_eb_surface	Should we write out the EB geometry in vtp format If true, it will only be written once,after initialization or restart	Bool	False
plt_geom	Should we write a plotfile holding 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. For codes that have been built with Ascent support, the following inputs must be preceded by “ascent.” and specifies the ascent actions for fluid and/or particles. The frequency which these are called is controlled by ascent_int or ascent_per_approx, see above. Note that if an ascent pipeline is being included in a GPU build/run, then you must enable managed memory, i.e., set amrex.the_arena_is_managed = true.

	Description	Type	Default
actions	yaml file of the ascent actions (ex. ascent_actions.yaml). If no file name is provided, then calls to Ascent are skipped.	String

The following inputs must be preceded by “mfix.solids.” and allow to write additional plotfiles which contain only solids variables in specific regions at fixed timesteps or approximated simulation times. All these parameters are user-defined.

	Description	Type	Default
regions	Specify regions that will be used for plotfiles	String
[region]	Specify which solids phases will be plotted	String
[region].plot_int	Specify timestep frequency for plotting the file	Int	0
[region].plot_per_approx	Specify time interval frequency for plotting the file	Real	0
[region].plt_regtest	Save all variables to plot file (overrides all other IO flags)	Int	0
[region].plt_radius	Save particle radius to plot file	Int	0
[region].plt_volume	Save particle volume to plot file	Int	0
[region].plt_mass	Save particle mass to plot file	Int	0
[region].plt_ro_p	Save particle density to plot file	Int	0
[region].plt_omoi	Save inverse of particle momentum of inertia to plot file	Int	0
[region].plt_vel_p	Save particle velocity to plot file	Int	0
[region].plt_omega_p	Save particle angular velocity to plot file	Int	0
[region].plt_statwt	Save particle statistical weight to plot file	Int	0
[region].plt_drag_p	Save particle drag force to plot file	Int	0
[region].plt_cp_s	Save particle specific heat coefficient to plot file	Int	0
[region].plt_T_p	Save particle temperature to plot file	Int	0
[region].plt_convection	Save particle convection coefficient to plot file	Int	0
[region].plt_X_s	Save particle species mass fractions to plot file	Int	0
[region].plt_vel_s_txfr	Save particle interphase velocity transfer to plot file	Int	0
[region].plt_h_s_txfr	Save particle interphase enthalpy transfer to plot file	Int	0
[region].plt_mass_sn_txfr	Save particle interphase mass transfer to plot file	Int	0
[region].plt_phase	Save particle phase to plot file	Int	0
[region].plt_state	Save particle state to plot file	Int	0

For each region with name [region] specified in the inputs, it will be saved a plotfile with name “partsXXXXX_[region]”, where XXXXX stands for the timestep number.

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