Convection heat dissipation structure topological optimization method capable of avoiding boundary material attachment

Abstract

The invention discloses a convection heat dissipation structure topological optimization method capable of avoiding boundary material attachment, and relates to the field of structure topology optimization design. The method is characterized in that the method comprises the following steps: 1, building a convection heat dissipation simulation model; 2, establishing a topological optimization model of the convection heat dissipation structure; and 3, updating design variables of the topological optimization model of the convection heat dissipation structure by adopting a moving asymptote algorithm, judging convergence, if not, repeating step 2 and step 3, and if convergence is carried out, outputting an optimization result. According to the method provided by the invention, convection heat dissipation related to the structure boundary can be accurately represented under the condition that a fluid model is not established, wrong application of a heat convection load in the topological optimization process is avoided, and the boundary material adhesion effect in the topological optimization of the convection heat dissipation structure based on the unit relative density gradient is avoided; and tedious and time-consuming thermal fluid simulation can be avoided.

Description

technical field [0001] The invention relates to the field of structure topology optimization design, in particular to a topology optimization method for convection and heat dissipation structures that can avoid the attachment of boundary materials. Background technique [0002] The convective heat dissipation structure is widely used in high-power and intensive electronic heating equipment such as electric vehicle batteries and supercomputing clusters. High-efficiency convection cooling structure design can prolong the service life of equipment, ensure its stable performance and safety, and is of great significance to the innovative design of industrial products. Structural topology optimization method is a simulation-driven structural design method, which is widely used to design lightweight structural configurations with excellent heat dissipation performance. [0003] In the study of structural topology optimization methods considering convective heat dissipation perform...

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Problems solved by technology

[0004] Although the topology optimization method of convective heat dissipation structure based on the fluid model can accurately simulate the process of structural convection heat dissipation, the computational complexity of the thermo-fluid coupling simulation is high, and the overall optimization efficiency is low. In the early stage of the optimization process, because the structure has not yet formed, CFD simulation is prone to failure. Convergence issues, which in turn cause the overall optimization process to fail

[0005] The topology optimization method based on the unit relative density convective heat transfer coefficient model assumes that in addition to the convective heat transfer at the structure boundary, there is also convective heat transfer in some non-boundary areas within the structure, and the thermal convective load cannot be accurately applied to the structure boundary during the optimization process; The convective heat transfer coefficient interpolation model based on the relative density gradient of adjacent units can accurately apply the thermal convective load to the structure boundary during the topology optimization process, which can avoid the unsteady and non-convergent fluid simulation under the nonlinear fluid heat dissipation model, which will lead to convective heat dissipation The structural topology optimization process is aborted; however, the convective heat dissipation structure topology optimization method that uses the relative density gradient of adjacent units to describe the structure boundary is prone to boundary material adhesion effects, and the designed structure usually contains thin walls that hinder air flow at the boundary of the design domain. Severe local optimal solution, the optimization result may even have closed holes inside the structure that cannot be accessed by external fluids, resulting in wrong application of convective loads inside the holes and non-optimized design

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