Displacement of a viscous defending fluid ($μ$def = 340 mPas by a less viscous invading fluid ($μ$inv = 0.99 mPas) in a radial micromodel with a diameter of 10 cm. It is patterned with cylindrical posts of height 100 $μ$m and median diameter 1.1 mm. The invading fluid is strongly wetting to the micromodel ($μ$ = 7°), and it advances by sequentially coating the perimeters of neighboring posts via corner flow at the low capillary number corresponding to this experiment (Ca=0.0058).
