In this paper, double-diffusion natural convection for staggered cavities with a concaved lower wall is investigated. The finite volume procedure is utilized to solve the governing equations along with the boundary conditions. The current code is validated with previously published results. Impacts of Rayleigh number (10⁴ ≤ Ra ≤ 10⁶), buoyancy ratio (− 5 ≤ N ≤ 5), Lewis number (1 ≤ Le ≤ 5), and aspect ratio (0.1 ≤ AR ≤ 0.2) on the flow characteristics are investigated and presented as isotherms, streamlines, and iso-concentrations contours. Moreover, alterations of average Nusselt and average Sherwood numbers with these parameters are analyzed and discussed thoroughly. It is found that average Nusselt and average Sherwood numbers augment with Rayleigh number and buoyancy ratio for aiding flows. These also are found to decrease with decreasing buoyancy ratio for opposing flows. Also, it is elucidated that the aspect ratio has an inverse relationship with average Nusselt and average Sherwood numbers in which the depression in these numbers is determined to be 10.4%.

本文研究了底壁为凹形的交错型腔的双扩散自然对流。利用有限体积程序来求解控制方程以及边界条件。当前代码已通过先前发布的结果进行验证。的瑞利数（10次冲击⁴  ≤太阳神≤10 ⁶），浮力比（ - 5≤  Ñ ≤5），路易斯数（1≤Le≤5）和流动特性的长宽比（0.1≤AR≤0.2）进行了研究，并以等温线，流线和等浓度线表示。此外，分析和讨论了平均努塞尔特数和平均舍伍德数随这些参数的变化。研究发现，平均努塞尔特数和平均舍伍德数随瑞利数和浮力比的增加而增加。还发现随着逆流的浮力比减小，这些减小。而且，阐明了纵横比与平均努塞尔数和平均舍伍德数具有反比关系，其中这些数的凹陷被确定为10.4％。