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I am trying to work on optimizing a heat sink model based on the attached paper. I am unable to simulate the model by applying CHBDYE as it is not supported in topology. I tried applying heat flux instead but I am having this error - Messages for the job: *** ERROR # 557 *** DRESP1 1 is not referenced from within a linear heat transfer SUBCASE. This type of response must be specified from within a linear heat transfer SUBCASE. This error occurs in DESOBJ 2. Can someone guide me in the right direction. I did follow this thread - . But havent fig out a way to get the 3D output as Alurcad got. I attached the 3D model file too. Thanking You, Amogh Taraikar Thermal Topology Optimization in OptiStruct Software.pdf Large_scale_three-dimensional_topology_optimisation_of_heat_sinks_cooled_by_natural_convection.pdf AM_T2.fem