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Operator splitting, adaptive time stepping, and other fixes for mixin…
…g layer and bubbles (#285) Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Hyeoksu Lee <[email protected]> Co-authored-by: Anand Radhakrishnan <[email protected]> Co-authored-by: Anand Radhakrishnan <[email protected]> Co-authored-by: Anand Radhakrishnan <[email protected]> Co-authored-by: Anand <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| #!/usr/bin/env python2 | ||
|
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||
| import math | ||
| import json | ||
|
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||
| # FLUID PROPERTIES ============================================================ | ||
| # Water | ||
| n_tait = 7.1 | ||
| B_tait = 306.E+06 | ||
| rho0 = 1.E+03 | ||
| mul0 = 1.002E-03 | ||
| ss = 0.07275 | ||
| pv = 2.3388E+03 | ||
|
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||
| # Vapor | ||
| gamma_v = 1.33 | ||
| M_v = 18.02 | ||
| mu_v = 0.8816E-05 | ||
| k_v = 0.019426 | ||
|
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||
| # Air | ||
| gamma_n = 1.4 | ||
| M_n = 28.97 | ||
| mu_n = 1.8E-05 | ||
| k_n = 0.02556 | ||
|
|
||
| # REFERENCE VALUES ============================================================ | ||
| R0ref = 50.E-06 | ||
| x0 = R0ref | ||
| p0 = 8236. # for Ca = 1 in mixing layer scale | ||
| u0 = math.sqrt( p0/rho0 ) | ||
| patm = 1. | ||
| cact = math.sqrt(n_tait*(p0+B_tait)/rho0) | ||
|
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| # NONDIMENSIONAL NUMBERS ====================================================== | ||
| Ca = (p0 - pv)/(rho0*(u0**2.)) # Cavitation number | ||
| We = rho0*(u0**2.)*R0ref/ss # Weber number | ||
| Re_inv = mul0/(rho0*u0*R0ref) # Inv. bubble Reynolds number | ||
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||
| # BUBBLES ===================================================================== | ||
| vf0 = 1e-5 | ||
| nb = 1 | ||
|
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||
| # DOMAIN ====================================================================== | ||
| Nx = 30 | ||
| Ldomain = 20.E-03 | ||
| L = Ldomain/x0 | ||
| dx = L/float(Nx+1) | ||
|
|
||
| # TIME STEPS ================================================================== | ||
| Tfinal = 0.05 | ||
| Nt = int(5e2+1) | ||
| t_save = 1 | ||
| dt = Tfinal/(Nt-1) | ||
|
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||
| # Configuring case dictionary | ||
| print(json.dumps({ | ||
| # Logistics ================================================ | ||
| 'run_time_info' : 'T', | ||
| # ========================================================== | ||
|
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||
| # Computational Domain Parameters ========================== | ||
| 'x_domain%beg' : -0.5*L, | ||
| 'x_domain%end' : 0.5*L, | ||
| 'stretch_x' : 'F', | ||
| 'cyl_coord' : 'F', | ||
| 'm' : Nx, | ||
| 'n' : 0, | ||
| 'p' : 0, | ||
| 'dt' : dt, | ||
| 't_step_start' : 0, | ||
| 't_step_stop' : Nt, | ||
| 't_step_save' : t_save, | ||
| # ========================================================== | ||
|
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||
| # Simulation Algorithm Parameters ========================== | ||
| 'num_patches' : 1, | ||
| 'model_eqns' : 2, | ||
| 'alt_soundspeed' : 'F', | ||
| 'num_fluids' : 1, | ||
| 'adv_alphan' : 'T', | ||
| 'mpp_lim' : 'F', | ||
| 'mixture_err' : 'F', | ||
| 'time_stepper' : 3, | ||
| 'weno_order' : 5, | ||
| 'weno_eps' : 1.E-16, | ||
| 'mapped_weno' : 'T', | ||
| 'null_weights' : 'F', | ||
| 'mp_weno' : 'T', | ||
| 'riemann_solver' : 2, | ||
| 'wave_speeds' : 1, | ||
| 'avg_state' : 2, | ||
| 'bc_x%beg' : -1, | ||
| 'bc_x%end' : -1, | ||
| # ========================================================== | ||
|
|
||
| # Formatted Database Files Structure Parameters ============ | ||
| 'format' : 1, | ||
| 'precision' : 2, | ||
| 'prim_vars_wrt' :'T', | ||
| 'parallel_io' :'T', | ||
| 'fd_order' : 1, | ||
| # ========================================================== | ||
|
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||
| # Patch 1 _ Background ===================================== | ||
| 'patch_icpp(1)%geometry' : 1, | ||
| 'patch_icpp(1)%x_centroid' : 0., | ||
| 'patch_icpp(1)%length_x' : L, | ||
| 'patch_icpp(1)%vel(1)' : 0., | ||
| 'patch_icpp(1)%pres' : 1000., | ||
| 'patch_icpp(1)%alpha_rho(1)' : (1.-vf0), | ||
| 'patch_icpp(1)%alpha(1)' : vf0, | ||
| 'patch_icpp(1)%r0' : 1., | ||
| 'patch_icpp(1)%v0' : 0., | ||
| # ========================================================== | ||
|
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||
| # Non-polytropic gas compression model AND/OR Tait EOS ===== | ||
| 'pref' : p0, | ||
| 'rhoref' : rho0, | ||
| # ========================================================== | ||
|
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||
| # Bubbles ================================================== | ||
| 'bubbles' : 'T', | ||
| 'bubble_model' : 2, | ||
|
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| # Nondimensional numbers | ||
| 'Ca' : Ca, | ||
| 'Web' : We, | ||
| 'Re_inv' : Re_inv, | ||
|
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| # adv_n | ||
| 'adv_n' : 'T', | ||
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| # adap_dt | ||
| 'adap_dt' : 'T', | ||
|
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| # Gas compression model | ||
| 'polytropic' : 'T', | ||
| 'thermal' : 1, | ||
|
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| # Polydispersity | ||
| 'polydisperse' : 'F', | ||
| 'nb' : nb, | ||
|
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| # QBMM | ||
| 'qbmm' : 'F', | ||
| # ========================================================== | ||
|
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| # Fluids Physical Parameters =============================== | ||
| # Surrounding liquid | ||
| 'fluid_pp(1)%gamma' : 1.E+00/(n_tait-1.E+00), | ||
| 'fluid_pp(1)%pi_inf' : n_tait*(B_tait/p0)/(n_tait-1.), | ||
| 'fluid_pp(1)%ss' : ss, | ||
| 'fluid_pp(1)%pv' : pv, | ||
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| # Last fluid_pp is always reserved for bubble gas state === | ||
| # if applicable ========================================== | ||
| 'fluid_pp(2)%gamma' : 1./(gamma_n-1.), | ||
| 'fluid_pp(2)%pi_inf' : 0.0E+00, | ||
| # ========================================================== | ||
|
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| })) | ||
|
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||
| # ============================================================================== |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| #!/usr/bin/env python3 | ||
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| import math | ||
| import json | ||
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| # FLUID PROPERTIES (WATER, VAPOR & AIR) ======================================== | ||
| # Water | ||
| rho_w = 1.E+03 # [kg/m3] density of water | ||
| gamma_w = 7.1 # [1] specific heat ratio | ||
| pi_inf_w = 3.06E+08 # [N/m2] water stiffness | ||
| # ============================================================================== | ||
|
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| # REFERENCE VALUES ============================================================= | ||
| x_ref = 0.002475 # [m] initial vorticity thickness | ||
| u_ref = 3.4343 # [m/s] upper stream velocity | ||
| # ============================================================================== | ||
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| # NON-DIMENSIONAL NUMBERS ====================================================== | ||
| Re = 50. # [1] Reynolds number based on the upper stream | ||
| # velocity and the initial vorticity thickness | ||
| # ============================================================================== | ||
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| # SPEED OF SOUND =============================================================== | ||
| pres = 8236. # [N/m2] pressure of water | ||
| c_w = math.sqrt(gamma_w*(pres+pi_inf_w)/rho_w) | ||
| # ============================================================================== | ||
|
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| # MODIFIED PROPERTIES FOR ARTIFICIAL MACH NUMBER ============================== | ||
| Ma_t = 0.1 # [1] target Mach number | ||
| pi_fac = (rho_w*u_ref**2/(gamma_w*Ma_t**2)-pres)/pi_inf_w | ||
| pi_inf_w = pi_inf_w*pi_fac | ||
| c_w = math.sqrt(gamma_w*(pres+pi_inf_w)/rho_w) | ||
| # ============================================================================= | ||
|
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| # SIMULATION SETUP ============================================================ | ||
| # Domain size | ||
| Lx = 59.0 | ||
| Ly = 59.0 | ||
|
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| # Number of grid cells | ||
| Nx = 191 | ||
| Ny = 191 | ||
|
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| # Grid spacing | ||
| dx = Lx/float(Nx+1) | ||
| dy = Ly/float(Ny+1) | ||
|
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| # Time advancement | ||
| cfl = 5e-1 | ||
| T = 20. | ||
| dt = cfl*dx/(1.+c_w/u_ref) | ||
| Ntfinal = int(T/dt) | ||
| Ntstart = 0 | ||
| Nfiles = 20 | ||
| t_save = int(math.ceil((Ntfinal-0)/float(Nfiles))) | ||
| Nt = t_save*Nfiles | ||
| t_step_start = Ntstart | ||
| t_step_stop = int(Nt) | ||
|
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| # ============================================================================== | ||
|
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||
|
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| # Configuring case dictionary | ||
| print(json.dumps({ | ||
| # Logistics ================================================================ | ||
| 'run_time_info' : 'T', | ||
| # ========================================================================== | ||
|
|
||
| # Computational Domain Parameters ========================================== | ||
| 'x_domain%beg' : 0., | ||
| 'x_domain%end' : Lx, | ||
| 'y_domain%beg' : -Ly/2., | ||
| 'y_domain%end' : Ly/2., | ||
| 'm' : Nx, | ||
| 'n' : Ny, | ||
| 'p' : 0, | ||
| 'dt' : dt, | ||
| 't_step_start' : t_step_start, | ||
| 't_step_stop' : t_step_stop, | ||
| 't_step_save' : t_save, | ||
| # ========================================================================== | ||
|
|
||
| # Simulation Algorithm Parameters ========================================== | ||
| 'num_patches' : 1, | ||
| 'model_eqns' : 2, | ||
| 'num_fluids' : 1, | ||
| 'time_stepper' : 3, | ||
| 'weno_order' : 5, | ||
| 'weno_eps' : 1.E-16, | ||
| 'weno_Re_flux' : 'T', | ||
| 'mapped_weno' : 'T', | ||
| 'riemann_solver' : 2, | ||
| 'wave_speeds' : 1, | ||
| 'avg_state' : 2, | ||
| 'bc_x%beg' : -1, | ||
| 'bc_x%end' : -1, | ||
| 'bc_y%beg' : -5, | ||
| 'bc_y%end' : -5, | ||
| # ========================================================================== | ||
|
|
||
| # Formatted Database Files Structure Parameters ============================ | ||
| 'format' : 1, | ||
| 'precision' : 2, | ||
| 'cons_vars_wrt' :'T', | ||
| 'prim_vars_wrt' :'T', | ||
| 'parallel_io' :'T', | ||
| 'fd_order' : 1, | ||
| 'omega_wrt(3)' :'T', | ||
| # ========================================================================== | ||
|
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||
| # Patch 1 ================================================================== | ||
| 'patch_icpp(1)%geometry' : 3, | ||
| 'patch_icpp(1)%x_centroid' : Lx/2., | ||
| 'patch_icpp(1)%y_centroid' : 0., | ||
| 'patch_icpp(1)%length_x' : Lx, | ||
| 'patch_icpp(1)%length_y' : Ly, | ||
| 'patch_icpp(1)%alpha_rho(1)' : 1., | ||
| 'patch_icpp(1)%alpha(1)' : 1., | ||
| 'patch_icpp(1)%vel(1)' : 1., | ||
| 'patch_icpp(1)%vel(2)' : 0., | ||
| 'patch_icpp(1)%pres' : pres/(rho_w*u_ref**2), | ||
| # ========================================================================== | ||
|
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| # Mixing layer === ========================================================= | ||
| 'vel_profile' : 'T', | ||
| 'instability_wave' : 'T', | ||
| # ========================================================================== | ||
|
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| # Artificial Mach number =================================================== | ||
| 'pi_fac' : pi_fac, | ||
| # ========================================================================== | ||
|
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| # Fluids Physical Parameters =============================================== | ||
| 'fluid_pp(1)%gamma' : 1.E+00/(gamma_w-1.E+00), | ||
| 'fluid_pp(1)%pi_inf' : gamma_w*(pi_inf_w/(rho_w*u_ref**2))/(gamma_w-1.E+00), | ||
| 'fluid_pp(1)%Re(1)' : Re, | ||
| # ========================================================================= | ||
| })) | ||
|
|
||
| # ============================================================================== |
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