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poisson equation basilisk

here is an exemple of poisson equation 2D poisson

here is an exemple of poisson equation in axisymetric cylindrical coordinate 2D poisson axisymetric

here is an exemple of poisson equation to simulate a silo 2D poisson silo

here is an simple exemple of sandglass with an lateral orifice:

here is an exemple of sandglass with an lateral orifice with moderate friction of the front and back wall and unsymmetric silo H = 3.9L :

here is an exemple of sandglass with an injection of air we solve Poisson equation and add the force of pressure to simulate the injection of air