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=========================================================================== =========================================================================== MAIN INPUT DATA FILE : 2D CHANNEL FLOW WITH A CONSTRICTION (A RECTANGULAR BAR) INCOMPRESSIBLE FLOW ISOTHERM DIMENSIONLESS LAYOUT : Length scale : h (the channel height) Reynolds number Re_h= rho_0.U_0.h/mu= 100 dimensionless quantities : velocity U* = U/U_0 kinetic viscosity= 1/Re_h dimensionless domain : Lx/h= 10 Initialisation = uniform velocity field inlet flowrate = parabolic profil INCOMPRESSIBLE DOWNSTEP FLOW ------------------------------------------ | | |_______| ---> inflow outflow ---> ------------------------------------------ J ^ | | ---->I =========================================================================== =========================================================================== &Version File_Version="VERSION2.0"/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ GENERAL LAYOUT (DIMENSIONLESS) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ &Fluid_Properties Reference_Dynamic_Viscosity = 1.00D-02, Reference_Density= 1.0 / &Velocity_Initialization I_Velocity_Reference_Value = 1.0 , J_Velocity_Reference_Value = 0.0 , K_Velocity_Reference_Value = 0.0 / =========================================================================== DOMAIN FEATURES (DIMENSIONLESS) =========================================================================== &Domain_Features Start_Coordinate_I_Direction= 0.00 , End_Coordinate_I_Direction= 10.00, Start_Coordinate_J_Direction= 0.00 , End_Coordinate_J_Direction= 1.00, Start_Coordinate_K_Direction= 0.00 , End_Coordinate_K_Direction= 0.00, Cells_Number_I_Direction= 256 ,Cells_Number_J_Direction= 64 ,Cells_Number_K_Direction= 1, Regular_Mesh= .true. / --------------------------------------------------- GEOMETRY OF THE IMMERSED BODIES --------------------------------------------------- First (and unique) immersed body &Polyhedral_Immersed_Bodies Xi_1= 4.5 , Xj_1= 0.5 ,Xk_1= 0.0 , Xi_2= 5.5 , Xj_2= 0.5 ,Xk_2= 0.0 , Xi_3= 5.5 , Xj_3= 1.0 ,Xk_3= 0.0 , Xi_4= 4.5 , Xj_4= 1.0 ,Xk_4= 0.0 , Wall_BC_DataSetName= "Set1"/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ DEFINITION OF BOUNDARY CONDITIONS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ============================================================================= WALL BOUNDARY CONDITION SETUP (DIMENSIONLESS) ============================================================================= --------------------------------------------------- DATA SET FOR THE WALL BOUNDARY CONDITIONS --------------------------------------------------- first set of wall boundary condition (This set corresponds to the default wall boundary conditions for the velocity. It is just shown as an example and could be removed) &Velocity_Wall_Boundary_Condition_Setup Wall_BC_DataSetName ="Set1", West_Wall_Velocity_I= 0.0 , East_Wall_Velocity_I= 0.0 , Back_Wall_Velocity_I= 0.0 , Front_Wall_Velocity_I= 0.0 , South_Wall_Velocity_I= 0.0 , North_Wall_Velocity_I= 0.0 , West_Wall_Velocity_J= 0.0 , East_Wall_Velocity_J= 0.0 , Back_Wall_Velocity_J= 0.0 , Front_Wall_Velocity_J= 0.0 , South_Wall_Velocity_J= 0.0 , North_Wall_Velocity_J= 0.0 , West_Wall_Velocity_K= 0.0 , East_Wall_Velocity_K= 0.0 , Back_Wall_Velocity_K= 0.0 , Front_Wall_Velocity_K= 0.0 , South_Wall_Velocity_K= 0.0 , North_Wall_Velocity_K= 0.0 / ============================================================================= INLET AND OUTLET BOUNDARY CONDITIONS (DIMENSIONLESS) ============================================================================= Keep in mind that the domain is enclosed by default. Here the inlet and outlet conditions are located at the ends of the domain. They replace the walls by default over the areas of interest. Inlet : Uniform flowrate profil &Inlet_Boundary_Conditions Type_of_BC= "INLET", Direction_Normal_Plan= 1 , Flow_Direction= 1 , Define_Velocity_profile = 1 , Plan_Location_Coordinate= 0.0 , Start_Coordinate_of_First_Span = 0.00 , End_Coordinate_of_First_Span = 1.00 , Start_Coordinate_of_Second_Span= 0.0 , End_Coordinate_of_Second_Span= 0.0 , Normal_Velocity_Reference_Value= 1.0 / &Outlet_Boundary_Conditions Type_of_BC= "OUTLET", Direction_Normal_Plan= 1 , Flow_Direction= 1 , Plan_Location_Coordinate= 10.0 , Start_Coordinate_of_First_Span = 0.00 , End_Coordinate_of_First_Span = 1.00 , Start_Coordinate_of_Second_Span= 0.0 , End_Coordinate_of_Second_Span= 0.0 / ============================================================================= BORDER BOUNDARY CONDITIONS ============================================================================= !--- No new boundary conditions are defined at the ends of the domain : walls by default are preserved, the inlet and outlet previously are defined above) !--- As "None" is the default setting for this namelist, it can be removed &Border_Domain_Boundary_Conditions West_BC_Name= "None" , East_BC_Name= "None" , Back_BC_Name= "None" , Front_BC_Name= "None" , North_BC_Name= "None" , South_BC_Name= "None" / ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ NUMERICAL METHODS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ &Numerical_Methods NS_NumericalMethod= "BDF2-SchemeO2" , !--- BDF2 + 2nd order centered scheme MomentumConvection_Scheme="Centered-O2-Conservative" , !--- conservative form for solving the velocity (momentum) equation Poisson_NumericalMethod="Home-SORMultigrid-ConstantMatrixCoef" / !--- SOR + multigrid method (homemade release) for solving the Poisson's equation with constant coefficient matrix &HomeData_PoissonSolver SolverName="SOR" , !--- Successive Over-Relaxation (SOR) method based on the red-black algorithm Relaxation_Coefficient= 1.7 , !--- Relaxation coefficient of the SOR method ( 1 <= Relaxation_Coefficient < 2) Number_max_Grid= 4, !--- Number of grid levels Number_max_Cycle= 10, !--- Number of multigrid cycles Number_Iteration= 0, !--- Maximum number of SOR iterations method applied for any grid level, if 0 (or removed) the 3 next data are considered Number_Iteration_FineToCoarseGrid= 15, !--- number of SOR iterations applied on any grid level during the restriction step (before the coarsest grid computation) Number_Iteration_CoarsestGrid= 15 , !--- number of SOR iterations applied on the coarsest grid Number_Iteration_CoarseToFineGrid= 15, !--- number of SOR iterations applied on any grid level during the prolongation step (after the Coarsest grid computation) Convergence_Criterion= 1.D-08 / !--- convergence tolerance on the residu of the Poisson's equation ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ SIMULATION MANAGEMENT ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The numerical time step is dynamic and is estimated by the constant CFL coefficient &Simulation_Management Restart_Parameter= 0 , Steady_Flow_Stopping_Criterion_Enabled = .true. , Steady_Flow_Stopping_Criterion = 1.D-16, Temporal_Iterations_Number = 100000 , Final_Time = 5.D+01 , TimeStep_Type = 1 , CFL_min= 0.25 , CFL_max= 0.25, Iterations_For_Timestep_Linear_Progress= 1 , Timestep_Max = 1.D+03 , Simulation_Backup_Rate = 1000 , Simulation_Checking_Rate = 101 / ============================================================================= PROBES MANAGEMENT ============================================================================= Probes order U , V , W , T , P , RHO &Probe_Quantities_Enabled Temporal_Series_For_Quantity_Enabled(:) = .true., .true., .false., .false., .true. , .false. / &Probe_Location Xi= 3.0 , Xj= 0.5 , Xk= 0.0 / &Probe_Location Xi= 6.0 , Xj= 0.5 , Xk= 0.0 / &Simulation_Management Probe_TimeIterationRecordingRate= 10 , Probe_StartTimeIterationRecording= 0 , Probe_RecordingReset=.false. / ============================================================================= FIELDS RECORDING DECLARATION ============================================================================= &Field_Recording_Setup Precision_On_Instantaneous_Fields= 2 / !--- Snapshots &Simulation_Management InstantaneousFields_RecordingReset=.false. , InstantaneousFields_TimeRecordingRate= 5.0E+00 , InstantaneousFields_RecordingStartTime= 0.D-00 / &Instantaneous_Fields_Listing Name_of_Field = "U " / First velocity component &Instantaneous_Fields_Listing Name_of_Field = "V " / Second velocity component !--- Statistics &Simulation_Management Start_Time_For_Statistics= 1.D+03 , Time_Range_Statistic_Calculation = 5.D+00 / &Statistical_Fields_Listing Name_of_Field = "<U> " , Recording_Enabled = .true. / &Statistical_Fields_Listing Name_of_Field = "<V> " , Recording_Enabled = .true. / END OF FILE

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