A numerical investigation is performed to exemplify the impression of a porous triangular body on the double-diffusive mixed convection traits in a cavity under the influence of magnetic field by employing lattice Boltzmann method. $A{l}_2{O}_3-H_{2}O$ nanofluid is considered as a working fluid, and the dynamically varying effective properties are measured through the Koo-Kleinstreuer-Li (KKL) model. The prime objective of the present analysis is to assess the repercussions of Richardson number ($Ri$ = 0, 1, 5 & 10), Darcy number (${10}^{-4}$ $\le$ $Da$ $\le$ ${10}^{-2}$), nanofluid volume fraction ($\Phi$ = 0% & 4%), and Hartmann number ($Ha$ = 0, 25 & 50) on flow, heat and concentration transfer characteristics in and around the porous body with high temperature and concentration. Also, the variation of thermal and concentration mixings, and their uniformities are examined. It is noticed that the flow field intensity is amplified while increasing $Da$, $Ri$ and $\Phi$, and is reduced while augmenting $Ha$. Besides, the effect of $Ha$ on the reduction of heat transfer to the enclosure walls is predominant at higher $Da$. The formation of thick thermal boundary layer along the slant edge of porous body due to the $Ri$ and $Da$ is significantly reduced while including nanoparticle in the base fluid. On contrary, increment in $\Phi$ dampens the concentration transfer traits. However, such adverse effect is efficiently controlled by $Ri$ variation. It is found that the $Ri$ enhancement assists $Da$ to significantly augment concentration transfer. Furthermore, the thermal and concentration mixings are mainly governed by $Da$ and $Ri$. In addition, the nanoparticle inclusion can alter the behaviour of permeability on concentration mixing and its uniformity.

采用格子玻尔兹曼方法进行数值研究，以举例说明多孔三角形体对磁场影响下腔内双扩散混合对流特性的影响。 $\mathrm{一种}{升}_2{哦}_3-H_2哦$纳米流体被认为是一种工作流体，动态变化的有效特性是通过 Koo-Kleinstreuer-Li (KKL) 模型测量的。本分析的主要目的是评估理查森数 ($\mathrm{电阻}\mathrm{一世}$ = 0, 1, 5 & 10), 达西数 (${10}^{-4}$ $\le$ $D\mathrm{一种}$ $\le$ ${10}^{-2}$), 纳米流体体积分数 ($\Phi$ = 0% & 4%) 和哈特曼数 ($H\mathrm{一种}$= 0, 25 & 50) 关于高温和高浓度多孔体内部和周围的流动、热和浓度传递特性。此外，还检查了热混合和浓度混合的变化及其均匀性。注意到流场强度在增加的同时被放大$D\mathrm{一种}$, $\mathrm{电阻}\mathrm{一世}$ 和 $\Phi$, 并且在增加的同时减少 $H\mathrm{一种}$. 此外，效果$H\mathrm{一种}$ 在减少热量传递到外壳壁上是主要的 $D\mathrm{一种}$. 沿多孔体倾斜边缘形成厚的热边界层是由于$\mathrm{电阻}\mathrm{一世}$ 和 $D\mathrm{一种}$显着减少，同时在基液中包含纳米颗粒。相反，增加$\Phi$抑制浓度转移特性。然而，这种不利影响是有效控制的$\mathrm{电阻}\mathrm{一世}$变化。据发现，该$\mathrm{电阻}\mathrm{一世}$ 增强辅助 $D\mathrm{一种}$显着增加浓度转移。此外，热混合和浓度混合主要由$D\mathrm{一种}$ 和 $\mathrm{电阻}\mathrm{一世}$. 此外，纳米颗粒夹杂物可以改变渗透性对浓度混合及其均匀性的行为。