Click here to come back to the previous page

MAIN INPUT DATA FILE : 2D HEAT-DRIVEN CAVITY FLOW DIMENSIONLESS FORM : Ra= 1.D+04 Density scale : rho_0 (fluid density) Length scale H : height of cavity Velocity scale ---> U0= (k/H).Ra**0.5 (k thermal diffusivity) Temperature scale Th - Tc (Th= T hot ; Tc= T cold) Dimensionless Velocity U*= U/U0 Dimensionless Temperature T*= (T-Tc)/(Th-Tc) dimensionless kinematic viscosity= Pr/Ra**0.5 dimensionless thermal diffusivity= 1/Ra**0.5 dimensionless buoyancy term = Pr.T* dimensionless domain Lx/H= 1 , Ly/H= 1 Reference results (De Wahl Davis, IJNMF , Vol 3, 1983): Averaged Nusselt number at the wall : 2.243 Averaged Nusselt number at the vertical mid-plane : 2.243 Maximum Nusselt number at the wall : 3.528 Minimum Nusselt number at the wall : 0.586 Maximum value of the vertical velocity (horizontal mid-plane) : 0.19617 Maximum value of the horizontal velocity (vertital mid-plane) : 0.16178 Q0= 0 (adiabatic) --------------------------------- | | | | | | | | | | Th | | Tc | | | | | | | | | | | | --------------------------------- Q0= 0 (adiabatic) J | | | ----> I =========================================================================== =========================================================================== ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ GENERAL LAYOUT ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ &Version File_Version="VERSION2.0"/ =========================================================================== FLUID PROPERTIES (DIMENSIONLESS FORM) =========================================================================== &Fluid_Properties Heat_Transfer_Flow = .true. , Reference_Density= 1.0, Reference_Temperature= 1.0 , Reference_Dynamic_Viscosity= 0.71D-02 , Reference_Heat_Capacity= 1.0 , Prandtl = 0.71 , Thermal_Expansion_Coefficient= 1.0 / =========================================================================== UNIFORM INITIALIZATION OF THE VELOCITY COMPONENTS AND TEMPERATURE (DIMENSIONLESS FORM) =========================================================================== &Velocity_Initialization I_Velocity_Reference_Value = 0.0 , J_Velocity_Reference_Value = 0.0 , K_Velocity_Reference_Value = 0.0 / &Temperature_Initialization Temperature_Reference_Value = 0.5 / =========================================================================== GRAVITY (DIMENSIONLESS FORM) =========================================================================== &Gravity Gravity_Enabled= .true. , Gravity_Angle_IJ= 90.0 , Gravity_Angle_IK= 90.0 , Reference_Gravity_Constant= 0.71/ =========================================================================== DOMAIN FEATURES =========================================================================== &Domain_Features Start_Coordinate_I_Direction= 0.00 , End_Coordinate_I_Direction= 1.00, 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= 64 ,Cells_Number_J_Direction=64 ,Cells_Number_K_Direction= 1, Regular_Mesh= .true. / ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ DEFINITION OF BOUNDARY CONDITIONS ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ============================================================================= WALL BOUNDARY CONDITION SETUP ============================================================================= Keep in mind that the domain is enclosed by default. No new boundary conditions are defined at the ends of the domain : the walls by default are preserved &Heat_Wall_Boundary_Condition_Setup Wall_BC_DataSetName ="Set1", West_Heat_BC_Option = 0 , East_Heat_BC_Option = 0 , Back_Heat_BC_Option = 1 , Front_Heat_BC_Option = 1 , South_Heat_BC_Option = 0 , North_Heat_BC_Option = 0, West_Wall_BC_Value= 1.0 , East_Wall_BC_Value= 0.0 , Back_Wall_BC_Value= 0.0 , Front_Wall_BC_Value= 0.0 , South_Wall_BC_Value= 0.0 , North_Wall_BC_Value= 0.0 / ============================================================================= BORDER BOUNDARY CONDITIONS : The walls located by default at the ends of the domain remain unchanged ============================================================================= !--- 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= 6, !--- Number of grid levels Number_max_Cycle= 1, !--- Number of multigrid cycles Number_Iteration_FineToCoarseGrid= 3, !--- number of SOR iterations applied on any grid level during the restriction step (before the coarsest grid computation) Number_Iteration_CoarseToFineGrid= 15, !--- number of SOR iterations applied on any grid level during the prolongation step (after the Coarsest grid computation) Number_Iteration_CoarsestGrid= 15 , !--- number of SOR iterations applied on the coarsest grid Convergence_Criterion= 1.D-08 / !--- convergence tolerance on the residu of the Poisson's equation ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ SIMULATION MANAGEMENT ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The numerical time step is estimated by means of the CFL coefficient &Simulation_Management Restart_Parameter= 0 , Steady_Flow_Stopping_Criterion_Enabled = .true. , Steady_Flow_Stopping_Criterion = 1.D-16, Temporal_Iterations_Number = 10000 , Final_Time = 5.D+02 , TimeStep_Type = 1 , Timestep_Min = 5.D-02 , Timestep_Max = 5.D-02 , CFL_Min = 0.5 , CFL_Max = 0.5 , Iterations_For_Timestep_Linear_Progress= 1, Simulation_Backup_Rate = 1000 , Simulation_Checking_Rate = 101 / ============================================================================= PROBES MANAGEMENT ============================================================================= NO PROBE ============================================================================= FIELDS RECORDING SETUP ============================================================================= &Simulation_Management InstantaneousFields_RecordingReset=.false. , InstantaneousFields_TimeRecordingRate= 5.0E+00 , InstantaneousFields_RecordingStartTime= 0.D-00 / &Field_Recording_Setup Check_Special_Features= "Heat_Driven_Cavity_Flow", Precision_On_Instantaneous_Fields= 2 / Here, a special variable devoted to results of heat driven cavity flows is active &Instantaneous_Fields_Listing Name_of_Field = "U " / First velocity component &Instantaneous_Fields_Listing Name_of_Field = "V " / Second velocity component &Instantaneous_Fields_Listing Name_of_Field = "T " / Temperature END OF FILE

Click here to come back to the previous page