Study On Topology Optimization Of Heat Transfer Structure By HCA

Topology optimization technology has been greatly developed since it was put forward in the 1988,and the research on the field of structural mechanics has been quite mature and extended to the fields of heat transfer and multi-field coupling,while the latter is still in the development stage.For the modern machinery industry and the electronics industry,the heat transfer structure design of the thermal structure is very important,such as the design of the heat dissipation mode of the computer chip,the design of the internal coolant pipe of the heat engine and so on.Nowadays,the design of this field can not be separated from thermodynamic calculation,heat dissipation experiment and so on,the most important is the experience of designers.However,the design of the radiator varies from domain to field,depending on the device,what kind of topology is the radiator of different products,which is a very important problem.It is a new idea to introduce the idea of topology optimization into the industrial design of radiator.The method is:to find the appropriate objective function,design variables,etc.,by optimizing the target of the computing structure under certain constraints,to obtain the topology structure to meet the target,and then from the conceptual design stage into the actual design stage,design the specific form and structure of the radiator.In this paper,based on the hybrid cellular automata(HCA)method,the topology optimization of heat transfer structure under thermal load is studied by using the variable density method to dynamically update the thermal material properties and material parameters in LS-DYNA keyword file by Matlab.The main contents of this paper include:(1)based on the cellular automata(CA)theory,a joint simulation system of cellular automata and LS-DYNA is established,and the automatic iterative calculation is realized.(2)The variable density method in topology optimization is analyzed,and the topological optimization method of structural mechanics is applied to the topology optimization design of heat conduction materials based on the solid isotropic material penalty model(SIMP),and the mathematical model of heat conduction structure is established as the basis for getting the heat transfer structure with good heat dissipation effect.(3)For low temperature materials with high thermal conductivity and heat source materials with high heating rate,it is an important measure to realize temperature field cooling by optimizing the layout of high thermal conductivity materials in the structure to achieve the reduction of internal temperature.Based on the SIMP method,the relative density of high thermal conductivity material is used as the description parameter of heat transfer path,the relative density relationship between heat conduction coefficient and heat rate is established,and the scientific structure distribution of high thermal conductivity material is obtained by using the minimum heat dissipation weakness as the objective function,and verified by numerical examples.