CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CD-adapco (http://www.cfd-online.com/Forums/cd-adapco/)
-   -   Reverse Flow Problem. (Hull with a Bulbous Bow )Towing Tank simulation. (http://www.cfd-online.com/Forums/cd-adapco/97884-reverse-flow-problem-hull-bulbous-bow-towing-tank-simulation.html)

Nyarla February 27, 2012 23:56

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 ..

sanjay February 29, 2012 02:30

1 Attachment(s)
I experiences the same problem after few iterations


regards
www.aerosapien.blogspot.com

sgrshukla March 13, 2012 20:04

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.

:)


All times are GMT -4. The time now is 15:04.