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Found 5 results

  1. 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
  2. Hi every one, I am trying to simulate a convection and conduction model and compare it with analytic results. I have a cube with K value of 100 as it can be seen in the attachment, with upper surface temperature of 40. The lower surface is exposed to free convection with amb. temp of 20 and H value of 40. The thinkness if cube is 0.35m. Analytical calculation of problem would yield lower surface temp. of 37.3 while simulation results always gets very close to ambient temperature. can anyone explain why there is a difference ? T1 = 40 K = 100 H = 40 Tamb = 20 L = 0.35 T2 = ? k.(T1-T2)/L = H(T2 - Tamb) T2 = 37.3
  3. Hi All, I have a question involving the HyperMesh preprocessor. I'm trying to run a transient thermal analysis, where there is a consistent base boundary condition, and convection is applied, but only after a delay. I'm having a hard time figuring out how to apply convection partway through the analysis. For example, I'm allowing the part to heat for 25 seconds, and then turning a fan on and blowing on it for the last 25. I have my TLOAD1, TABLED1, SPCD, and SPC collectors for convection, but I can't figure out how to apply this delay. I tried setting the TABLED1 value to 0 for the first 25 seconds, but that just sets temperature to zero I believe. I imagine the DELAY_OPTION would be helpful, but I don't know how. Thanks very much for any help you can provide.
  4. We typically suggest to use temperature_flow if the properties are strongly dependent on temperature. Treating flow and temperature as one large matrix can aid convergence in these cases. The degree to which it aids convergence will be extremely problem dependent, so it is difficult to make a blanket statement. If the free convection is dominant, temp-flow would have more effect than if the forced convection is dominant. If the flow equations don't depend on temperature, solving them separately will be faster.
  5. Hi, I have a model to do the steady heat transfer analysis. In this model, there is one face with convection boundary condition. I get the result. However, I want to measure the total heat loss through this convection surface. Through the hyperview, I can only get the element heat flux. But the convection area for each element are different. Is there any method I can directly measure the heat loss through the convection interface or any method that I can used by define a formulation in hyperview. Great thanks for help. Yunlong
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