“…These density variations may occur due to gradients in the fluid composition or temperature. Simultaneous occurrence of both gradients causes a type of flow known as double-diffuse convection (DDC), thermosolutal or thermohaline flow [38,40]. Instances of DDC in porous media are widespread, ranging from large scale problems in geothermal engineering [31], CO 2 sequestration [25,26], nuclear waste disposal [22] and enhanced recovery of issue of simulation under uncertainty.…”