| Nicola_Fontana |
November 26, 2021 05:42 |
CFG file for Nozzle
3 Attachment(s)
Hi everyone,
I would like to ask if anyone could help me or provide me general infromation about the settings of the configuration file for this two mesh. I already tried with different settings, but I can't get convergence in both case.
I can't figure out if the problem is in the boundary condition or in the setting of convergence criteria.
1. Subsonic Converging Nozzle
In this case I would like to simulate the subsonic flow throught the nozzle, including the outern region;
Code:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% SU2 configuration file %
% Case description: Air flow in converging nozzle %
% %
% Author: Nicola Fontana %
% Institution: %
% Date: 24.11.2021 %
% File Version 7.2 %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% ------------- DIRECT, ADJOINT, AND LINEARIZED PROBLEM DEFINITION ------------%
%
% Physical governing equations (EULER, NAVIER_STOKES,
% FEM_EULER, FEM_NAVIER_STOKES, FEM_RANS, FEM_LES,
% WAVE_EQUATION, HEAT_EQUATION, FEM_ELASTICITY,
% POISSON_EQUATION)
%
%SOLVER = EULER
%
SOLVER= RANS
%
% Specify turbulence model (NONE, SA, SA_NEG, SST, SA_E, SA_COMP, SA_E_COMP)
KIND_TURB_MODEL= SA
%
% Mathematical problem (DIRECT, CONTINUOUS_ADJOINT, DISCRETE_ADJOINT)
MATH_PROBLEM= DIRECT
%
% Restart solution (NO, YES)
RESTART_SOL= NO
%
% System of measurements (SI, US)
% International system of units (SI): ( meters, kilograms, Kelvins,
% Newtons = kg m/s^2, Pascals = N/m^2,
% Density = kg/m^3, Speed = m/s,
% Equiv. Area = m^2 )
% United States customary units (US): ( inches, slug, Rankines, lbf = slug ft/s^2,
% psf = lbf/ft^2, Density = slug/ft^3,
% Speed = ft/s, Equiv. Area = ft^2 )
SYSTEM_MEASUREMENTS= SI
%
% -------------------- COMPRESSIBLE FREE-STREAM DEFINITION --------------------%
%
% Mach number (non-dimensional, based on the free-stream values)
MACH_NUMBER= 1E-9
%
% Angle of attack (degrees, only for compressible flows)
AOA= 0.0
%
% Side-slip angle (degrees, only for compressible flows)
SIDESLIP_ANGLE= 0.0
%
% Init option to choose between Reynolds (default) or thermodynamics quantities
% for initializing the solution (REYNOLDS, TD_CONDITIONS)
INIT_OPTION= TD_CONDITIONS
%
% Free-stream option to choose between density and temperature (default) for
% initializing the solution (TEMPERATURE_FS, DENSITY_FS)
FREESTREAM_OPTION= TEMPERATURE_FS
%
% Free-stream pressure (101325.0 N/m^2, 2116.216 psf by default)
FREESTREAM_PRESSURE= 101300
%
% Free-stream temperature (288.15 K, 518.67 R by default)
FREESTREAM_TEMPERATURE= 290
%
% Compressible flow non-dimensionalization (DIMENSIONAL, FREESTREAM_PRESS_EQ_ONE,
% FREESTREAM_VEL_EQ_MACH, FREESTREAM_VEL_EQ_ONE)
%REF_DIMENSIONALIZATION= DIMENSIONAL
% Reynolds number (non-dimensional, based on the free-stream values)
%REYNOLDS_NUMBER= 540000
%
% Reynolds length (1 m, 1 inch by default)
REYNOLDS_LENGTH= 1
% -------------------- BOUNDARY CONDITION DEFINITION --------------------------%
%
% Navier-Stokes (no-slip), constant heat flux wall marker(s) (NONE = no marker)
% Format: ( marker name, constant heat flux (J/m^2), ... )
MARKER_HEATFLUX= ( wall, 0.0 )
%
% Symmetry boundary marker(s) (NONE = no marker)
MARKER_SYM= ( simmetry )
%
% Riemann boundary marker(s) (NONE = no marker)
% Format: (marker, data kind flag, list of data)
%MARKER_RIEMANN= ( farfield, TOTAL_CONDITIONS_PT, 101300, 298.15, 1.0, 0.0, 0.0, outlet, STATIC_PRESSURE, 100000, 0.0, 0.0, 0.0, 0.0 )
% Inlet boundary marker(s) (NONE = no marker)
% Format: ( inlet marker, total temperature, total pressure, flow_direction_x,
% flow_direction_y, flow_direction_z, ... ) where flow_direction is
% a unit vector.
MARKER_INLET= ( farfield, 288.6, 103010.0, 1.0, 0.0, 0.0 )
%
% Outlet boundary marker(s) (NONE = no marker)
% Format: ( outlet marker, back pressure (static), ... )
MARKER_OUTLET= ( outlet, 101300.0 )
% ------------- COMMON PARAMETERS DEFINING THE NUMERICAL METHOD ---------------%
%
% Numerical method for spatial gradients (GREEN_GAUSS, WEIGHTED_LEAST_SQUARES)
NUM_METHOD_GRAD= GREEN_GAUSS
%
% CFL number (initial value for the adaptive CFL number)
CFL_NUMBER= 0.1
%
% Adaptive CFL number (NO, YES)
%CFL_ADAPT= YES
%
% Parameters of the adaptive CFL number (factor down, factor up, CFL min value,
% CFL max value )
%CFL_ADAPT_PARAM= ( 0.1, 2.0, 10.0, 1000.0 )
%
% Maximum Delta Time in local time stepping simulations
MAX_DELTA_TIME= 1E6
% ----------- SLOPE LIMITER AND DISSIPATION SENSOR DEFINITION -----------------%
%
% Monotonic Upwind Scheme for Conservation Laws (TVD) in the flow equations.
% Required for 2nd order upwind schemes (NO, YES)
MUSCL_FLOW= YES
%
% Slope limiter (NONE, VENKATAKRISHNAN, VENKATAKRISHNAN_WANG,
% BARTH_JESPERSEN, VAN_ALBADA_EDGE)
%SLOPE_LIMITER_FLOW= NONE
%
% Monotonic Upwind Scheme for Conservation Laws (TVD) in the turbulence equations.
% Required for 2nd order upwind schemes (NO, YES)
%MUSCL_TURB= NO
% ------------------------ LINEAR SOLVER DEFINITION ---------------------------%
%
% Linear solver or smoother for implicit formulations (BCGSTAB, FGMRES, SMOOTHER_JACOBI,
% SMOOTHER_ILU, SMOOTHER_LUSGS,
% SMOOTHER_LINELET)
LINEAR_SOLVER= FGMRES
%
% Preconditioner of the Krylov linear solver (ILU, LU_SGS, LINELET, JACOBI)
LINEAR_SOLVER_PREC= ILU
%
% Linael solver ILU preconditioner fill-in level (0 by default)
LINEAR_SOLVER_ILU_FILL_IN= 0
%
% Minimum error of the linear solver for implicit formulations
LINEAR_SOLVER_ERROR= 1E-10
%
% Max number of iterations of the linear solver for the implicit formulation
LINEAR_SOLVER_ITER= 20
% -------------------------- MULTIGRID PARAMETERS -----------------------------%
%
% Multi-grid levels (0 = no multi-grid)
MGLEVEL= 0
% -------------------- FLOW NUMERICAL METHOD DEFINITION -----------------------%
%
% Convective numerical method (JST, LAX-FRIEDRICH, CUSP, ROE, AUSM, AUSMPLUSUP, AUSMPLUSUP2, HLLC,
% TURKEL_PREC, MSW, FDS)
CONV_NUM_METHOD_FLOW= ROE
%
% Entropy fix coefficient (0.0 implies no entropy fixing, 1.0 implies scalar
% artificial dissipation)
%ENTROPY_FIX_COEFF= 0.1
%
% Time discretization (RUNGE-KUTTA_EXPLICIT, EULER_IMPLICIT, EULER_EXPLICIT)
TIME_DISCRE_FLOW= EULER_IMPLICIT
% -------------------- TURBULENT NUMERICAL METHOD DEFINITION ------------------%
%
% Convective numerical method (SCALAR_UPWIND)
CONV_NUM_METHOD_TURB= SCALAR_UPWIND
%
% Time discretization (EULER_IMPLICIT)
TIME_DISCRE_TURB= EULER_IMPLICIT
%
% Reduction factor of the CFL coefficient in the turbulence problem
CFL_REDUCTION_TURB= 1.0
% --------------------------- CONVERGENCE PARAMETERS --------------------------%
% Convergence field (see available fields with the -d flag at the command line)
%CONV_FIELD= RMS_DENSITY
%
% Number of total iterations
ITER= 5000
%
% Min value of the residual (log10 of the residual)
CONV_RESIDUAL_MINVAL= -10
%
% Start convergence criteria at iteration number
CONV_STARTITER= 10
% ------------------------- INPUT/OUTPUT INFORMATION --------------------------%
%
% Mesh input file
MESH_FILENAME= C_Nozzle_Curve.su2
%
% Mesh input file format (SU2, CGNS)
MESH_FORMAT= SU2
%
% Mesh output file
MESH_OUT_FILENAME= mesh_out.su2
%
% Restart flow input file
SOLUTION_FILENAME= solution_flow.dat
%
% Output file format (TECPLOT, TECPLOT_BINARY, PARAVIEW, PARAVIEW_BINARY,
% FIELDVIEW, FIELDVIEW_BINARY)
TABULAR_FORMAT= CSV
%
% Output file convergence history (w/o extension)
CONV_FILENAME= history
%
% Output file restart flow
RESTART_FILENAME= restart_flow.dat
%
% Output file flow (w/o extension) variables
VOLUME_FILENAME= flow
%
% Output file surface flow coefficient (w/o extension)
SURFACE_FILENAME= surface_flow
%
% Writing solution file frequency
OUTPUT_WRT_FREQ= 1000
%
% Screen output
SCREEN_OUTPUT= (INNER_ITER, RMS_DENSITY, RMS_TKE, RMS_DISSIPATION, LIFT, DRAG)
2. Supersonic Diverging Nozzle
Code:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% SU2 configuration file %
% Case description: Supersonic isentropic nozzle flow %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% ------------- DIRECT, ADJOINT, AND LINEARIZED PROBLEM DEFINITION ------------%
%
% Physical governing equations (EULER, NAVIER_STOKES,
% TNE2_EULER, TNE2_NAVIER_STOKES,
% WAVE_EQUATION, HEAT_EQUATION, LINEAR_ELASTICITY,
% POISSON_EQUATION)
SOLVER = EULER
%
%SOLVER= RANS
%
% Specify turbulence model (NONE, SA, SA_NEG, SST, SA_E, SA_COMP, SA_E_COMP)
%KIND_TURB_MODEL= SA
% Mathematical problem (DIRECT, ADJOINT, LINEARIZED)
MATH_PROBLEM = DIRECT
% Restart solution (NO, YES)
RESTART_SOL = NO
% -------------------- COMPRESSIBLE FARFIELD DEFINITION --------------------%
% Mach number (non-dimensional, based on the free-stream values)
MACH_NUMBER = 1.0
% Angle of attack (degrees, only for compressible flows)
AOA = 0.0
% Init option to choose between Reynolds (default) or thermodynamics quantities
% for initializing the solution (REYNOLDS, TD_CONDITIONS)
INIT_OPTION = REYNOLDS
% Free-stream option to choose between density and temperature (default) for
% initializing the solution (TEMPERATURE_FS, DENSITY_FS)
FREESTREAM_OPTION = TEMPERATURE_FS
% Free-stream pressure (101325.0 N/m^2, 2116.216 psf by default)
FREESTREAM_PRESSURE = 3697978.51402
% Free-stream temperature (288.15 K, 518.67 R by default)
FREESTREAM_TEMPERATURE = 3000
% Reynolds length (1 m by default)
REYNOLDS_LENGTH = 1.0
% ---------------------- REFERENCE VALUE DEFINITION ---------------------------%
% Reference origin for moment computation
REF_ORIGIN_MOMENT_X = 0.00
REF_ORIGIN_MOMENT_Y = 0.00
REF_ORIGIN_MOMENT_Z = 0.00
% Reference length for pitching, rolling, and yawing non-dimensional moment
REF_LENGTH = 1.0
% Reference area for force coefficients (0 implies automatic calculation)
REF_AREA = 0
% ------------------------- IDEAL GAS PROPERTIES -----------------------------%
% Different gas model (STANDARD_AIR, IDEAL_GAS, VW_GAS, PR_GAS)
FLUID_MODEL = IDEAL_GAS
% Ratio of specific heats (1.4 default and the value is hardcoded for the model STANDARD_AIR)
GAMMA_VALUE = 1.4
% Specific gas constant (287.058 J/kg*K default, hardcoded for model STANDARD_AIR)
GAS_CONSTANT = 287.0
% -------------------- BOUNDARY CONDITION DEFINITION --------------------------%
% Euler wall boundary marker(s) (NONE = no marker)
MARKER_EULER = ( Nozzle )
% Riemann boundary marker(s) (NONE = no marker)
% Format: (marker, data kind flag, list of data)
MARKER_RIEMANN= ( Inlet, TOTAL_CONDITIONS_PT, 3697978.51402, 3000, 1.0, 0.0, 0.0, Outlet, STATIC_PRESSURE, 200000.0, 0.0, 0.0, 0.0, 0.0 )
% Farfield marker (NONE = no marker)
%MARKER_FAR = ( Inlet )
% Symmetry boundary marker(s) (NONE = no marker)
MARKER_SYM = ( Symmetry )
% Supersonic outlet boundary marker(s) (NONE = no marker)
%MARKER_SUPERSONIC_OUTLET = ( Outlet )
% ------------------------ SURFACES IDENTIFICATION ----------------------------%
% Marker(s) of the surface to be plotted or designed
MARKER_PLOTTING = ( Symmetry )
% Marker(s) of the surface where the functional (Cd, Cl, etc.) will be evaluated
MARKER_MONITORING = ( Nozzle, Symmetry )
% ------------- COMMON PARAMETERS DEFINING THE NUMERICAL METHOD ---------------%
% Numerical method for spatial gradients (GREEN_GAUSS, WEIGHTED_LEAST_SQUARES)
NUM_METHOD_GRAD = WEIGHTED_LEAST_SQUARES
% Courant-Friedrichs-Lewy condition of the finest grid
CFL_NUMBER = 15
% Adaptive CFL number (NO, YES)
%CFL_ADAPT = YES
% Parameters of the adaptive CFL number (factor down, factor up, CFL min value,
% CFL max value )
CFL_ADAPT_PARAM = ( 0.5, 1.5, 1.0, 100.0 )
% Runge-Kutta alpha coefficients
RK_ALPHA_COEFF = ( 0.66667, 0.66667, 1.000000 )
% Number of total iterations
ITER = 10000
%
OBJECTIVE_FUNCTION= DRAG
% ------------------------ LINEAR SOLVER DEFINITION ---------------------------%
% Linear solver for implicit formulations (BCGSTAB, FGMRES)
LINEAR_SOLVER = FGMRES
% Preconditioner of the Krylov linear solver (JACOBI, LINELET, LU_SGS)
LINEAR_SOLVER_PREC = JACOBI
% Minimum error of the linear solver for implicit formulations
LINEAR_SOLVER_ERROR = 1E-4
% Max number of iterations of the linear solver for the implicit formulation
LINEAR_SOLVER_ITER = 10
% -------------------------- MULTIGRID PARAMETERS -----------------------------%
% Multi-Grid Levels (0 = no multi-grid)
MGLEVEL = 2
% Multi-grid cycle (V_CYCLE, W_CYCLE, FULLMG_CYCLE)
MGCYCLE = V_CYCLE
% Multi-grid pre-smoothing level
MG_PRE_SMOOTH = ( 1, 2, 3, 3 )
% Multi-grid post-smoothing level
MG_POST_SMOOTH = ( 0, 0, 0, 0 )
% Jacobi implicit smoothing of the correction
MG_CORRECTION_SMOOTH = ( 0, 0, 0, 0 )
% Damping factor for the residual restriction
MG_DAMP_RESTRICTION = 0.8
% Damping factor for the correction prolongation
MG_DAMP_PROLONGATION = 0.8
% -------------------- FLOW NUMERICAL METHOD DEFINITION -----------------------%
% Convective numerical method (JST, LAX-FRIEDRICH, CUSP, ROE, AUSM, HLLC,
% TURKEL_PREC, MSW)
CONV_NUM_METHOD_FLOW = JST
%
% Monotonic Upwind Scheme for Conservation Laws (TVD) in the flow equations.
% Required for 2nd order upwind schemes (NO, YES)
MUSCL_FLOW= YES
%
% Slope limiter (VENKATAKRISHNAN, BARTH_JESPERSEN)
SLOPE_LIMITER_FLOW = VENKATAKRISHNAN
% Coefficient for the limiter (smooth regions)
VENKAT_LIMITER_COEFF = 100.0
% 2nd and 4th order artificial dissipation coefficients
JST_SENSOR_COEFF = ( 0.5, 0.02 )
% Time discretization (RUNGE-KUTTA_EXPLICIT, EULER_IMPLICIT, EULER_EXPLICIT)
TIME_DISCRE_FLOW = EULER_IMPLICIT
% --------------------------- CONVERGENCE PARAMETERS --------------------------%
% Convergence criteria (CAUCHY, RESIDUAL)
CONV_CRITERIA = RESIDUAL
% Min value of the residual (log10 of the residual)
CONV_RESIDUAL_MINVAL = -12
% Start convergence criteria at iteration number
CONV_STARTITER = 10
% Number of elements to apply the criteria
CONV_CAUCHY_ELEMS = 100
% Epsilon to control the series convergence
CONV_CAUCHY_EPS = 1E-6
% ------------------------- INPUT/OUTPUT INFORMATION --------------------------%
% Mesh input file
MESH_FILENAME = SD_Nozzle_Coarse.su2
%Mesh input file format (SU2, CGNS, NETCDF_ASCII)
MESH_FORMAT = SU2
% Mesh output file
MESH_OUT_FILENAME = mesh_out.su2
% Restart flow input file
SOLUTION_FILENAME = restart.dat
% Output file format (CSV, TECPLOT)
TABULAR_FORMAT = CSV
% Output file convergence history (w/o extension)
CONV_FILENAME = history
% Output file restart flow
RESTART_FILENAME = restart.dat
% Output file flow (w/o extension) variables
VOLUME_FILENAME = Flow_Sup
% Output file surface flow coefficient (w/o extension)
SURFACE_FILENAME = surface
% Writing solution file frequency
OUTPUT_WRT_FREQ = 500
Thank you in advance for the replies,
Nicola |
