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| Improved smoothed particle hydrodynamics simulation of natural convection heat transfer problem |
| Received:November 08, 2023 Revised:December 08, 2023 |
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| DOI：10.7511/jslx20231108002 |
| KeyWord:smoothed particle hydrodynamics natural convection heat transfer closed square cavity numerical simulation |
| Author | Institution |
| 许晓阳 |
西安科技大学 人工智能与计算机学院, 西安 |
| 于巍 |
西安科技大学 人工智能与计算机学院, 西安 |
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| Abstract: |
| Based on an improved Smoothed Particle Hydrodynamics(SPH)method,a numerical simulation of natural convection heat transfer in a closed square cavity was carried out.In order to suppress the non-physical oscillation caused by the hypothesis of week compressibility in the pressure field,the density dissipation term is introduced into the continuity equation.In order to overcome the tensile instability caused by the uneven distributions of particles,the particle shifting technique is combined.In order to improve the accuracy and numerical stability of the gradient operator,a kernel function gradient correction algorithm is applied.Firstly,the improved SPH method is used to simulate the natural convection heat transfer in a closed square cavity with Rayleigh number Ra=104 and the effectiveness of the method is verified by comparing the results with those obtained by the finite volume method.Then,the simulation is extended to Ra=105 and 106,and the distributions of velocity field and temperature field under different Rayleigh numbers are discussed.The influences of different physical parameters on natural convection heat transfer are analyzed.The numerical results show that the improved SPH method can simulate the natural convection heat transfer problem accurately and effectively. |