CFD Online Discussion Forums - Reverse Flow Problem. (Hull with a Bulbous Bow )Towing Tank simulation.

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)

- Siemens (https://www.cfd-online.com/Forums/siemens/)

- - Reverse Flow Problem. (Hull with a Bulbous Bow )Towing Tank simulation. (https://www.cfd-online.com/Forums/siemens/97884-reverse-flow-problem-hull-bulbous-bow-towing-tank-simulation.html)

Reverse Flow Problem. (Hull with a Bulbous Bow )Towing Tank simulation.

Hi everyone ..

I am writing here after attempting desperately several times to resolve the reverse flow problem which appears after few iterations.... I set the initial conditions and the boundary conditions (velocity inlet, pressure outlet, symmetry and wall )..6DoF hull body ..VoF wave..multiphase mixture ..etc....everything seems correct but when I use a hull with a bulbous bow the simulation collapses cuz of a reverse flow !...dont understand why ? is it the meshing method !

for meshing i chose the models : Surface Remesher ..Trimmer .. Prism layer mesher..and applied volumetric control with Z axis anisotropic ..repeated the simulations with diff mesh qualities and still hit the same problem ....

any advice will be highly appreciated ..

I experiences the same problem after few iterations

regards
www.aerosapien.blogspot.com

reverse flow fraction

the boundary where reverse flow occurs should be provided with 1 for either fluid. suppose if you provide fraction 1 for water and 0 for air it will only allow water to come in through reverse flow.

:)