# Transient simulation

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 August 23, 2004, 04:26 Transient simulation #1 Pramila Guest   Posts: n/a Hi... i want to solve a set of transport equations containing transient and steady state equations..If i were to run the simulation as transient how do i eliminate the time derivative term d( )/dt from the steady state equation....kindly let me know..thank you. Regards-Pramila.

 August 26, 2004, 07:34 Re: Transient simulation #2 FV Guest   Posts: n/a Try to increase the time-step to infinity while solving the steady state equations, while retaining a small time-step for the transiemt part.

 October 1, 2010, 04:01 #3 New Member   hoaiphuong Join Date: Sep 2010 Posts: 8 Rep Power: 9 Please help me! When I simulate my model. It has an error in solver-manager... I don't know while I set parameter, it is reasonable or not... Thank you very much in advance ! 1.jpg 2.jpg And this is code for solution : "&replace FLOW: Flow Analysis 1 ANALYSIS TYPE: Option = Transient EXTERNAL SOLVER COUPLING: Option = None END INITIAL TIME: Option = Automatic with Value Time = 0 [s] END TIME DURATION: Option = Total Time Total Time = 10 [s] END TIME STEPS: Option = Timesteps Timesteps = 0.1 [s] END END DOMAIN: Default Coord Frame = Coord 0 Domain Type = Fluid Location = part_1 BOUNDARY: Default Default Boundary Type = WALL Create Other Side = Off Interface Boundary = Off Location = wall part_1 BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Adiabatic END MASS AND MOMENTUM: Option = No Slip Wall END WALL ROUGHNESS: Option = Smooth Wall END END END BOUNDARY: Inlet Boundary Type = INLET Interface Boundary = Off Location = inlet BOUNDARY CONDITIONS: FLOW REGIME: Option = Subsonic END HEAT TRANSFER: Option = Static Temperature Static Temperature = 298 [K] END MASS AND MOMENTUM: Normal Speed = Vinlet Option = Normal Speed END TURBULENCE: Option = Medium Intensity and Eddy Viscosity Ratio END END END BOUNDARY: Outlet Boundary Type = OUTLET Interface Boundary = Off Location = outlet BOUNDARY CONDITIONS: FLOW REGIME: Option = Subsonic END MASS AND MOMENTUM: Option = Average Static Pressure Pressure Profile Blend = 0.05 Relative Pressure = 0 [Pa] END PRESSURE AVERAGING: Option = Average Over Whole Outlet END END END DOMAIN MODELS: BUOYANCY MODEL: Option = Non Buoyant END DOMAIN MOTION: Option = Stationary END MESH DEFORMATION: Option = None END REFERENCE PRESSURE: Reference Pressure = 1 [atm] END END FLUID DEFINITION: Fluid 1 Material = Air at 25 C Option = Material Library MORPHOLOGY: Option = Continuous Fluid END END FLUID MODELS: COMBUSTION MODEL: Option = None END HEAT TRANSFER MODEL: Option = Thermal Energy END THERMAL RADIATION MODEL: Option = None END TURBULENCE MODEL: Option = k epsilon END TURBULENT WALL FUNCTIONS: Option = Scalable END END INITIALISATION: Option = Automatic INITIAL CONDITIONS: Velocity Type = Cartesian CARTESIAN VELOCITY COMPONENTS: Option = Automatic END STATIC PRESSURE: Option = Automatic END TEMPERATURE: Option = Automatic END TURBULENCE INITIAL CONDITIONS: Option = k and Epsilon EPSILON: Option = Automatic END K: Option = Automatic END END END END END OUTPUT CONTROL: MONITOR OBJECTS: MONITOR BALANCES: Option = Full END MONITOR FORCES: Option = Full END MONITOR PARTICLES: Option = Full END MONITOR RESIDUALS: Option = Full END MONITOR TOTALS: Option = Full END END RESULTS: File Compression Level = Default Option = Standard END TRANSIENT RESULTS: Transient Results 1 File Compression Level = Default Option = Standard OUTPUT FREQUENCY: Option = Every Timestep END END TRANSIENT STATISTICS: Transient Statistics 1 Option = Arithmetic Average Output Variables List = Pressure END END SOLUTION UNITS: Angle Units = [rad] Length Units = [m] Mass Units = [kg] Solid Angle Units = [sr] Temperature Units = [K] Time Units = [s] END SOLVER CONTROL: Turbulence Numerics = First Order ADVECTION SCHEME: Option = High Resolution END CONVERGENCE CONTROL: Maximum Number of Coefficient Loops = 3 Minimum Number of Coefficient Loops = 1 Timescale Control = Coefficient Loops END CONVERGENCE CRITERIA: Residual Target = 1.E-4 Residual Type = RMS END TRANSIENT SCHEME: Option = Second Order Backward Euler TIMESTEP INITIALISATION: Option = Automatic END END END END "

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