Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

Mohsen Nazari; Ladan Louhghalam; Mohamad Hassan Kayhani

doi:10.1016/j.cjche.2014.10.008

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Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

流体力学与传递现象 | Updated：2026-01-06

- Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle
- Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle
- 中国化学工程学报（英文版） 2015年23卷第1期页码：22-30
- Affiliations：
  
  Department of Mechanical Engineering, University of Shahrood, Shahrood,Iran
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2014.10.008
  中图分类号：
- 纸质出版：2015
- Accepted：
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Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani. Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle[J]. 中国化学工程学报（英文版）, 2015,23(1):22-30.

Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani. Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle[J]. Chin.J.Chem.Eng., 2015, 23(1): 22-30.
Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani. Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle[J]. 中国化学工程学报（英文版）, 2015,23(1):22-30. DOI： 10.1016/j.cjche.2014.10.008.

Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani. Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle[J]. Chin.J.Chem.Eng., 2015, 23(1): 22-30. DOI： 10.1016/j.cjche.2014.10.008.

摘要

Abstract

Double diffusion convection in a cavity with a hot square obstacle inside is simulated using the lattice Boltzmann method. The results are presented for the Rayleigh numbers 10

and 10

the Lewis numbers 0.1

2 and 10 and aspect ratio A (obstacle height/cavity height) of 0.2

0.4 and 0.6 for a range of buoyancy number N=0 to -4 with the effect of opposing flow. The results indicate that for |N| 1

the Nusselt and Sherwood numbers decrease as buoyancy ratio increases

while for |N|1

they increase with |N|. As the Lewis number increases

higher buoyancy ratio is required to overcome the thermal effects and the minimum value of the Nusselt and Sherwood numbers occur at higher buoyancy ratios. The increase in the Rayleigh or Lewis number results in the formation of the multi-cell flow in the enclosure and the vortices will vanish as |N| increases.

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