CN-116306367-B - CFD calculation method for heat dissipation of running shoes

CN116306367BCN 116306367 BCN116306367 BCN 116306367BCN-116306367-B

Abstract

The application provides a CFD calculation method for heat dissipation of running shoes, which comprises the steps of S1, constructing a running shoe system three-dimensional model, S2, preprocessing the running shoe system three-dimensional model to obtain a preprocessing result, wherein the preprocessing result comprises a structural three-dimensional grid obtained by coupling the running shoe system three-dimensional model in a fluid domain model and then importing grid dividing software, and S3, carrying out CFD calculation according to the preprocessing result to obtain a calculation result. By implementing the technical scheme of the application, more accurate data can be obtained.

Inventors

HUANG HAIJIAO
LI CAIYU
WANG YINGNAN
YU BENGANG

Assignees

北京服装学院

Dates

Publication Date: 20260505
Application Date: 20230313

Claims (8)

1. The CFD calculation method for heat dissipation of running shoes is characterized by comprising the following steps of: Step S1, constructing a running shoe system three-dimensional model, wherein the running shoe system three-dimensional model comprises a running shoe three-dimensional model and a shoe tree three-dimensional model arranged in the running shoe three-dimensional model, and a porous medium is used for replacing a vamp mesh part; s2, preprocessing the running shoe system three-dimensional model to obtain a preprocessing result, wherein the preprocessing result comprises a shoe tree, a running shoe and a structured three-dimensional grid of an external flow field, wherein the shoe tree, the running shoe and the structured three-dimensional grid are obtained by coupling the running shoe system three-dimensional model in a fluid domain model and then importing grid division software; step S3, performing CFD calculation according to the pretreatment result to obtain a calculation result; the step S3 includes: determining a fluid control equation, a porous medium Darcy coefficient and a turbulence model; Setting material properties and air material properties of all parts of the running shoe system; setting medium flow boundary conditions, inlet speed boundary conditions and outlet pressure boundary conditions; Setting solid and fluid conditions; the simulation calculation is finished until the residual curve is stably converged, so as to obtain a calculation result; the method comprises the steps of determining a control equation and a momentum equation source term of a porous medium model in a calculation domain, and determining a Darcy coefficient of the porous medium according to experimental data of pressure loss versus speed, wherein the solid condition is that material properties of solids are defined, heat generation rate which is the same as that of experiments is set on a shoe last to serve as a heat source, material properties consistent with real running shoes are set in different areas of the running shoes, and the temperature of the running shoes is consistent with that of an air environment.
2. The CFD calculating method for heat dissipation of running shoes according to claim 1, wherein the step S1 includes: three-dimensional scanning is carried out on the shoe tree and the running shoe by utilizing a three-dimensional scanner to obtain a shoe tree three-dimensional model and a running shoe three-dimensional model, and the shoe tree three-dimensional model is placed on the running shoe three-dimensional model according to a real position; Simplifying the three-dimensional model obtained by scanning to remove the structure which does not influence the heat dissipation calculation; the scanned three-dimensional model is partitioned to distinguish different material parts and mesh parts and non-mesh parts of the vamp.
3. A CFD calculation method for heat dissipation of running shoes according to claim 1 or 2, wherein said step S2 includes: establishing a fluid domain model in preprocessing software, and placing the running shoe system three-dimensional model in the fluid domain model for coupling to obtain a three-dimensional geometric model; And importing the three-dimensional geometric model into grid dividing software to generate a structured three-dimensional grid of the shoe tree, the running shoe and the external flow field, and taking the structured three-dimensional grid as a pretreatment result.
4. The CFD calculation method for heat dissipation of running shoes according to claim 1, wherein the turbulence model uses a k-epsilon model, the solving type is steady state calculation, the solving method is an implicit method based on a pressure coupling equation set, and pressure, momentum, energy and turbulence energy equations are all discretized by adopting a second-order windward format.
5. The method of CFD calculation for heat dissipation in running shoes of claim 1, wherein the material properties include solid material properties including thermal conductivity, specific heat capacity, density, and molecular weight, and medium material properties including kinematic viscosity, linear planner's number, specific heat capacity, enthalpy, and molecular weight.
6. A CFD calculation method for heat dissipation of running shoes according to claim 1, wherein the inlet speed boundary condition is set to a speed inlet of 3m/s and the outlet pressure boundary condition is set to a pressure outlet equal to atmospheric pressure.
7. The method for calculating CFD for heat dissipation of running shoes according to claim 1, wherein the fluid condition is that air is selected, and the temperature is consistent with the experimental temperature.
8. The CFD calculation method for heat dissipation of running shoes according to claim 1, wherein the method comprises the steps of S4, performing post-processing according to the calculation result; The step S4 comprises displaying temperature distribution cloud patterns of shoe trees, running shoes and mediums, and/or displaying velocity vector patterns of fluid mediums, and/or displaying pressure distribution cloud patterns of various positions of a model.

Description

CFD calculation method for heat dissipation of running shoes Technical Field The application relates to the field of computational fluid dynamics, in particular to a CFD (computational fluid dynamics) calculation method for heat dissipation of running shoes. Background With the increasing importance of people on self health, the number of people in home sports and outdoor sports is increasing, and the people also attach more importance to the profession and comfort of sports equipment. The running proportion of the sports is higher and higher, and the requirements of people on the thermal comfort of running shoes are also higher and higher. Among other things, temperature is one of the key objective factors affecting footwear comfort. The temperature of the shoe cavity is an important indicator for displaying the microclimate in the shoe, and the heat exchange capacity of the shoe and the surrounding environment determines the comfort of the wearer, namely, the comprehensive balance of biological thermodynamics is achieved among the microenvironment of the system formed by the foot, the shoe and the shoe cavity. When the ventilation property of running shoes is poor, heat generated by movement can be accumulated in the shoes and can not be dissipated, the temperature in the shoes is gradually increased, and feet feel sultry and uncomfortable. These conditions increase bacterial growth, leading to fungal infections and foot odor. In addition, the moist environment can also increase friction between the skin and the shoe, resulting in blisters and scratches. Thus, microclimate changes in the shoe promote microbial growth, resulting in odor generation and deterioration of foot health. At present, the method is used for evaluating heat dissipation. In the past, detailed and comprehensive data cannot be obtained by methods such as a thermometer, a sensor and the like, and the efficiency is low. The simulation research method only considers the heat conduction analysis in the static state, does not consider the heat dissipation analysis of running shoes in the real scene under the strong convection condition, and has serious model simplification, so that the deviation of the calculation result is larger. Disclosure of Invention In order to solve at least one technical problem in the prior art, the application provides a CFD calculation method for heat dissipation of running shoes. According to an aspect of the application, there is provided a CFD calculation method for heat dissipation of running shoes, including: step S1, constructing a running shoe system three-dimensional model, wherein the running shoe system three-dimensional model comprises a running shoe three-dimensional model and a shoe tree three-dimensional model arranged in the running shoe three-dimensional model; Step S2, preprocessing the three-dimensional model of the running shoe system to obtain a preprocessing result, wherein the preprocessing result comprises a structured three-dimensional grid obtained by placing the three-dimensional model of the running shoe system in a fluid domain model for coupling and then importing grid dividing software; And step S3, performing CFD calculation (computational fluid dynamics Computational Fluid Dynamics) according to the pretreatment result to obtain a calculation result. Optionally, the step S1 includes: three-dimensional scanning is carried out on the shoe tree and the running shoe by utilizing a three-dimensional scanner to obtain a shoe tree three-dimensional model and a running shoe three-dimensional model, and the shoe tree three-dimensional model is placed on the running shoe three-dimensional model according to a real position; Simplifying the three-dimensional model obtained by scanning to remove the structure which does not influence the heat dissipation calculation; the scanned three-dimensional model is partitioned to distinguish different material parts and mesh parts and non-mesh parts of the vamp, and the mesh parts of the vamp are replaced by porous media. Optionally, the step S2 includes: establishing a fluid domain model in preprocessing software, and placing the running shoe system three-dimensional model in the fluid domain model for coupling to obtain a three-dimensional geometric model; And importing the three-dimensional geometric model into grid dividing software to generate a structured three-dimensional grid of the shoe tree, the running shoe and the external flow field, and taking the structured three-dimensional grid as a pretreatment result. Optionally, the step S3 includes: determining a fluid control equation, a porous medium Darcy coefficient and a turbulence model; Setting material properties and air material properties of all parts of the running shoe system; setting medium flow boundary conditions, inlet speed boundary conditions and outlet pressure boundary conditions; Setting solid and fluid conditions; and (3) performing simulation calculation until the residual cur