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‎docs/documentation/case.md‎

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@@ -66,8 +66,9 @@ There are multiple sets of parameters that must be specified in the python input
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6. [Formatted Database and Structure Parameters](#6-formatted-output)
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7. [(Optional) Acoustic Source Parameters](#7-acoustic-source)
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8. [(Optional) Ensemble-Averaged Bubble Model Parameters](#8-ensemble-averaged-bubble-model)
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9. [(Optional) Velocity Field Setup Parameters](#9-velocity-field-setup)
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Items 7 and 8 are optional sets of parameters that activate the acoustic source model and ensemble-averaged bubble model, respectively.
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Items 7, 8, and 9 are optional sets of parameters that activate the acoustic source model, ensemble-averaged bubble model, and initial velocity field setup, respectively.
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Definition of the parameters is described in the following subsections.
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### 1. Runtime
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| `format` | Integer | Output format. [1]: Silo-HDF5; [2] Binary |
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| `precision` | Integer | [1] Single; [2] Double |
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| `parallel_io` | Logical | Parallel I/O |
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| `cons_vars_wrt` | Logical | Write conservative variables \|
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| `cons_vars_wrt` | Logical | Write conservative variables |
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| `prim_vars_wrt` | Logical | Write primitive variables |
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| `alpha_rho_wrt(i)` | Logical | Add the partial density of the fluid $i$ to the database \|
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| `rho_wrt` | Logical | Add the mixture density to the database |
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| `alpha_wrt(i)` | Logical | Add the volume fraction of fluid $i$ to the database |
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| `gamma_wrt` | Logical | Add the specific heat ratio function to the database |
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| `heat_ratio_wrt` | Logical | Add the specific heat ratio to the database |
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| `pi_inf_wrt` | Logical | Add the liquid stiffness function to the database \|
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| `pi_inf_wrt` | Logical | Add the liquid stiffness function to the database |
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| `pres_inf_wrt` | Logical | Add the liquid stiffness to the formatted database |
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| `c_wrt` | Logical | Add the sound speed to the database |
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| `omega_wrt(i)` | Logical | Add the $i$-direction vorticity to the database |
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| `schlieren_wrt` | Logical | Add the numerical schlieren to the database|
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| `qm_wrt` | Logical | Add the Q-criterion to the database|
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| `fd_order` | Integer | Order of finite differences for computing the vorticity and the numerical Schlieren function [1,2,4] |
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| `schlieren_alpha(i)` | Real | Intensity of the numerical Schlieren computed via `alpha(i)` |
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| `probe_wrt` | Logical | Write the flow chosen probes data files for each time step |
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`gamma_v`, `M_v`, `mu_v`, and `k_v` specify the specific heat ratio, molecular weight, viscosity, and thermal conductivity of a chosen component.
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Implementation of the parameterse into the model follow [Ando (2010)](references.md#Ando10).
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### 9. Velocity Field Setup
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| Parameter | Type | Description |
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| ---: | :----: | :--- |
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| `perturb_flow` | Logical | Perturb the initlal velocity field by random noise |
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| `perturb_sph` | Logical | Perturb the initial partial density by random noise |
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| `perturb_sph_fluid` | Integer | Fluid component whose partial density to be perturbed |
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| `vel_profile` | Logical | Set the mean streamwise velocity to hyperbolic tangent profile |
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| `instability_wave` | Logical | Perturb the initial velocity field by instability waves |
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The table lists velocity field parameters. The parameters are optionally used to define initial velocity profiles and perturbations.
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- `perturb_flow` activates the perturbation of initial velocity by random noise.
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- `perturb_sph` activates the perturbation of intial partial density by random noise.
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- `perturb_sph_fluid` specifies the fluid component whose the partial density to be perturbed.
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- `vel_profile` activates setting the mean streamwise velocity to hyperbolic tangent profile. This option works only for 2D and 3D cases.
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- `instability_wave` activates the perturbation of initial velocity by instability waves obtained from linear stability analysis for a mixing layer with hyperbolic tangent mean streamwise velocity profile. This option only works for 2D and 3D cases, together with `vel_profile`=TRUE.
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## Enumerations
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### Boundary conditions

‎examples/3D_turb_mixing/case.py‎

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#!/usr/bin/env python3
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import math
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import json
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# SURROUNDING FLOW =============================================================
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# Nondimensional parameters
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Re0 = 50. # Reynolds number
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M0 = 0.2 # Mach number
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# Fluid properties
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gamma = 1.4
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pi_inf = 0.
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# Free stream velocity & pressure
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u0 = 1.
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pres0 = 1./(gamma*M0**2)
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# Domain size
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Lx = 59.0
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Ly = 59.0
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Lz = 59.0
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# Number of grid cells
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Nx = 255
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Ny = 255
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Nz = 255
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# Grid spacing
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dx = Lx/float(Nx)
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dy = Ly/float(Ny)
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dz = Lz/float(Nz)
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# Time advancement
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cfl = 0.1
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T = 100.
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dt = cfl*dx/u0
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Ntfinal = int(T/dt)
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Ntstart = 0
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Nfiles = 100
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t_save = int(math.ceil((Ntfinal-0)/float(Nfiles)))
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Nt = t_save*Nfiles
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t_step_start = Ntstart
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t_step_stop = int(Nt)
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# ==============================================================================
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# Configuring case dictionary
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print(json.dumps({
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# Logistics ================================================================
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# 'case_dir' : '\'.\'',
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'run_time_info' : 'T',
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# ==========================================================================
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# Computational Domain Parameters ==========================================
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'x_domain%beg' : 0.,
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'x_domain%end' : Lx,
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'y_domain%beg' : -Ly/2.,
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'y_domain%end' : Ly/2.,
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'z_domain%beg' : 0.,
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'z_domain%end' : Lz,
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'm' : Nx,
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'n' : Ny,
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'p' : Nz,
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'dt' : dt,
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't_step_start' : t_step_start,
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't_step_stop' : t_step_stop,
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't_step_save' : t_save,
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# ==========================================================================
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# Simulation Algorithm Parameters ==========================================
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'num_patches' : 1,
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'model_eqns' : 2,
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'num_fluids' : 1,
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'adv_alphan' : 'T',
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'time_stepper' : 3,
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'weno_vars' : 2,
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'weno_order' : 5,
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'weno_eps' : 1.E-16,
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'weno_Re_flux' : 'T',
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'mapped_weno' : 'T',
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'riemann_solver' : 2,
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'wave_speeds' : 1,
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'avg_state' : 2,
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'bc_x%beg' : -1,
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'bc_x%end' : -1,
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'bc_y%beg' : -5,
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'bc_y%end' : -5,
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'bc_z%beg' : -1,
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'bc_z%end' : -1,
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# ==========================================================================
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# Formatted Database Files Structure Parameters ============================
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'format' : 1,
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'precision' : 2,
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'cons_vars_wrt' :'T',
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'prim_vars_wrt' :'T',
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'parallel_io' :'T',
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'fd_order' : 1,
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'omega_wrt(1)' :'T',
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'omega_wrt(2)' :'T',
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'omega_wrt(3)' :'T',
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'qm_wrt' :'T',
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# ==========================================================================
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# Patch 1 ==================================================================
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'patch_icpp(1)%geometry' : 9,
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'patch_icpp(1)%x_centroid' : Lx/2.,
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'patch_icpp(1)%y_centroid' : 0.,
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'patch_icpp(1)%z_centroid' : Lz/2.,
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'patch_icpp(1)%length_x' : Lx,
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'patch_icpp(1)%length_y' : Ly,
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'patch_icpp(1)%length_z' : Lz,
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'patch_icpp(1)%alpha_rho(1)' : 1.,
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'patch_icpp(1)%alpha(1)' : 1.,
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'patch_icpp(1)%vel(1)' : u0,
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'patch_icpp(1)%vel(2)' : 0.,
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'patch_icpp(1)%vel(3)' : 0.,
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'patch_icpp(1)%pres' : pres0,
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# ==========================================================================
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# Mixing layer =============================================================
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'vel_profile' : 'T',
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'instability_wave' : 'T',
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# ==========================================================================
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# Fluids Physical Parameters ===============================================
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# Surrounding liquid
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'fluid_pp(1)%gamma' : 1./(gamma-1.),
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'fluid_pp(1)%pi_inf' : 0.,
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'fluid_pp(1)%Re(1)' : Re0,
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# =========================================================================
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}))
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# ==============================================================================

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