Thermosolutal convection under cross-diffusion effect in SGSP with porous layer

•LBM simulation of thermosolutal convection in a SGSP enclosure with porous layer.•Cross-diffusive effects on thermosolutal convection in this SGSP enclosure are analyzed.•Attaching a porous layer at the bottom inhibits the thermal and solutal transfer processes.•Du enhances both thermal and solutal transfer processes, while Sr boosts the solutal one.•Internal heat generation reduces the positive influence of Soret and Dufour effect.