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2D acoustic pulse with subsonic pressure outflow
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Anand
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Nov 7, 2024
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| import math | ||
| import json | ||
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| # Numerical setup | ||
| Nx = 99 | ||
| Ny = 99 | ||
| dx = 8./(1.*(Nx+1)) | ||
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| alf_st = 0.4 | ||
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| p_inf = 101325 | ||
| rho_inf = 1 | ||
| gam = 1.4 | ||
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| c = math.sqrt(gam*(p_inf) / rho_inf) | ||
| cfl = 0.3 | ||
| mydt = cfl * dx / c | ||
| Tfinal = 80*1 / c | ||
| Nt = int(Tfinal/mydt) | ||
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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' : -4, | ||
| 'x_domain%end' : 4, | ||
| 'y_domain%beg' : -4, | ||
| 'y_domain%end' : 4, | ||
| 'm' : Nx, | ||
| 'n' : Ny, | ||
| 'p' : 0, | ||
| 'dt' : mydt, | ||
| 't_step_start' : 0, | ||
| 't_step_stop' : Nt, | ||
| 't_step_save' : int(Nt/100), | ||
| # ========================================================================== | ||
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| # Simulation Algorithm Parameters ========================================== | ||
| 'num_patches' : 2, | ||
| 'model_eqns' : 2, | ||
| 'alt_soundspeed' : 'F', | ||
| 'num_fluids' : 1, | ||
| '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' : 'F', | ||
| 'riemann_solver' : 2, | ||
| 'wave_speeds' : 1, | ||
| 'avg_state' : 2, | ||
| 'bc_x%beg' : -8, | ||
| 'bc_x%end' : -8, | ||
| 'bc_y%beg' : -8, | ||
| 'bc_y%end' : -8, | ||
| # ========================================================================== | ||
|
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| # Formatted Database Files Structure Parameters ============================ | ||
| 'format' : 1, | ||
| 'precision' : 2, | ||
| 'prim_vars_wrt' :'T', | ||
| 'parallel_io' :'T', | ||
| 'omega_wrt(3)' :'T', | ||
| 'fd_order' : 2, | ||
| # ========================================================================== | ||
|
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| # Patch 1 ================================================================== | ||
| 'patch_icpp(1)%geometry' : 3, | ||
| 'patch_icpp(1)%x_centroid' : 0, | ||
| 'patch_icpp(1)%y_centroid' : 0, | ||
| 'patch_icpp(1)%length_x' : 8., | ||
| 'patch_icpp(1)%length_y' : 8., | ||
| 'patch_icpp(1)%vel(1)' : 0, | ||
| 'patch_icpp(1)%vel(2)' : 0, | ||
| 'patch_icpp(1)%pres' : p_inf, | ||
| 'patch_icpp(1)%alpha_rho(1)' : rho_inf, | ||
| 'patch_icpp(1)%alpha(1)' : 1., | ||
| # ========================================================================== | ||
|
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| # Patch 2 ================================================================== | ||
| 'patch_icpp(2)%geometry' : 2, | ||
| 'patch_icpp(2)%x_centroid' : 0, | ||
| 'patch_icpp(2)%y_centroid' : 0, | ||
| 'patch_icpp(2)%radius' : 1., | ||
| 'patch_icpp(2)%vel(1)' : 0, | ||
| 'patch_icpp(2)%vel(2)' : 0, | ||
| 'patch_icpp(2)%pres' : f"{p_inf}*(1 - 0.5*({gam} - 1)*({alf_st})**2*exp(0.5*(1 - sqrt(x**2 + y**2))))**({gam} / ({gam} - 1))", | ||
| 'patch_icpp(2)%alpha_rho(1)' : f"{rho_inf}*(1 - 0.5*({gam} - 1)*({alf_st})**2*exp(0.5*(1 - sqrt(x**2 + y**2))))**(1 / ({gam} - 1))", | ||
| 'patch_icpp(2)%alpha(1)' : 1., | ||
| 'patch_icpp(2)%alter_patch(1)' : 'T', | ||
| # ========================================================================== | ||
|
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| # CBC Inflow / Outflow ======================================== | ||
| 'bc_x%grcbc_in' : 'F', | ||
| 'bc_x%grcbc_out' : 'T', | ||
| 'bc_x%grcbc_vel_out' : 'F', | ||
| 'bc_x%pres_out' : p_inf, | ||
| 'bc_y%grcbc_in' : 'F', | ||
| 'bc_y%grcbc_out' : 'T', | ||
| 'bc_y%grcbc_vel_out' : 'F', | ||
| 'bc_y%pres_out' : p_inf, | ||
| # # ======================================================================== | ||
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| # Fluids Physical Parameters =============================================== | ||
| 'fluid_pp(1)%gamma' : 1.E+00/(gam-1.E+00), | ||
| 'fluid_pp(1)%pi_inf' : 0.0, | ||
| # ========================================================================== | ||
| })) | ||
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| # ============================================================================== |