摘要 Solution to the heat equation in a pump casing model using the finite elment modelling software Elmer . The mesh is intentionally quite coarse for presentation purposes. The equation solved is given by the following elmer input file. Geometery is distributed with elmer as pump_carter_sup.stp
Header CHECK KEYWORDS Warn Mesh DB "." "." Include Path "" Results Directory "" End Simulation Max Output Level = 4 Coordinate System = Cartesian Coordinate Mapping ( 3 ) = 2 4 6 Simulation Type = Steady state Steady State Max Iterations = 1 Output Intervals = 1 Timestepping Method = BDF BDF Order = 1 Solver Input File = case . sif Post File = case . ep End Constants Gravity ( 4 ) = 0 - 1 0 9.82 Stefan Boltzmann = 5.67e-08 Permittivity of Vacuum = 8.8542e-12 Boltzmann Constant = 1.3807e-23 Unit Charge = 1.502e-19 End Body 1 Target Bodies ( 1 ) = 1 Name = "Body Property 1" Equation = 1 Material = 1 Body Force = 6 End Solver 1 Equation = Heat Equation Variable = - dofs 1 Temperature Procedure = "HeatSolve" "HeatSolver" Exec Solver = Always Stabilize = True Bubbles = False Lumped Mass Matrix = False Optimize Bandwidth = True Steady State Convergence Tolerance = 1.0e-5 Nonlinear System Convergence Tolerance = 1.0e-8 Nonlinear System Max Iterations = 20 Nonlinear System Newton After Iterations = 3 Nonlinear System Newton After Tolerance = 1.0e-3 Nonlinear System Relaxation Factor = 1 Linear System Solver = Iterative Linear System Iterative Method = BiCGStab Linear System Max Iterations = 500 Linear System Convergence Tolerance = 1.0e-8 Linear System Preconditioning = ILU0 Linear System ILUT Tolerance = 1.0e-3 Linear System Abort Not Converged = False Linear System Residual Output = 1 Linear System Precondition Recompute = 1 End Equation 1 Name = "Equation 1" Active Solvers ( 1 ) = 1 End Material 1 Name = "Steel (alloy - generic)" Poisson ratio = 0.285 Heat expansion Coefficient = 1 2.0e-6 Youngs modulus = 20 0.0e9 Heat Conductivity = 3 7.2 Sound speed = 510 0.0 Heat Capacity = 97 6.0 Mesh Poisson ratio = 0.285 Density = 785 0.0 Poisson ratio = 0.287 Youngs modulus = 20 0.0e9 End Body Force 1 Name = "BodyForce 1" Heat Source = 0.05 End Boundary Condition 1 Target Boundaries ( 1 ) = 57 Name = "BoundaryCondition 1" Temperature = 293 End
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法语 Visualisation of heat transfer in a pump casing