Check Keywords Warn Header Mesh DB "." "radiation" End Constants Stefan Boltzmann = 5.67e-8 End Simulation Coordinate System = Axi Symmetric Simulation Type = Steady State Steady State Max Iterations = 1 Output Intervals = 1 Output File = "radiation.result" Post File = "radiation.vtu" End Body 1 Equation = 1 Body Force = 1 Material = 1 Initial Condition = 1 End Body 2 Equation = 1 Material = 2 Initial Condition = 1 End Initial Condition 1 Temperature = 250.0 End Body Force 1 Heat Source = 10000 End Material 1 Density = 1.0 Heat Conductivity = 10.0 Heat Capacity = 1.0 End Material 2 Density = 1.0 Heat Conductivity = 1.0 Heat Capacity = 1.0 End Solver 1 Equation = Heat Equation Stabilize = True Linear System Solver = Iterative Linear System Iterative Method = BiCGStab Linear System Convergence Tolerance = 1.0e-12 Linear System Max Iterations = 500 Linear System Preconditioning = ILU Nonlinear System Newton After Iterations = 1 Nonlinear System Newton After Tolerance = 1.0e-4 Nonlinear System Max Iterations = 50 NonLinear System Convergence Tolerance = 1.0e-8 Steady State Convergence Tolerance = 1.0e-8 Nonlinear System Relaxation Factor = 0.7 End Equation 1 Active Solvers = 1 End Boundary Condition 1 Target Boundaries = 1 Heat Flux BC = True Radiation = Diffuse Gray Radiation Target Body = -1 Emissivity = 0.6 End Boundary Condition 2 Target Boundaries = 2 Heat Flux BC = True Radiation = Diffuse Gray Radiation Target Body = -1 Emissivity = 0.1 End Boundary Condition 3 Target Boundaries = 3 Temperature = 100.0 End