Hi everybody

I am trying to model a free surface flow. I have a closed cavity(3D), with a pipe in it. The pipe rests in a liquid, and the liquid level is known ( half of the cavity is full of liquid) the pipe is rotating with a certain rpm and the rise of the liquid is expected in the pipe.

So at first I tried to model the problem in 2 D , with axis symmetric swirl. The grid is structural and fine I choose VOF with geo-reconstruct with implicit body force treatment on. Defined a swirl velocity using the rotat. speed and the geometry (rad. cood X w) and patched the region in the pipe with it. Also patched the initial liquid level. Unsteady analysis implicit, 1st order, with standard k-e model. Body force discr. for pressure, PISO pres-vel coupling, with skewness and neighbour correction on. All under-rel params are 1. The time step is 1e-5, and I tried many configurations but could not reach a physical solution..(that is a capillary rise on the wall of the pipe ?) Chose engine oil as the liq and air as the gas phase. I tried surface tension, wall adhesion etc. But still could not get a solution So any comments? any suggestions will be very helpful. Regards

Leo Lay

of the pi

Did you defined the operation pressure in a point where you know there is no fluid? Also try a not so heavy liquid.

Regards

newbie

what is happening with gravitation, is it defined/enabled, in patricular direction/axes

anna

I both defined the operation density and the gravity (-y direction with a magnitude of 9.81) but still no solution.. Leo

hi Leo, My problem is also almost similar. but in my problem, there is cryogenic liquid in the closed enclosure and is partially filled. I have to study the effect due to the aplication of heat flux on the walls. when using geo-reconstruct, liquid is gettiing into vapor zone as disperse. so i started giving g value from 0 and increased to 9.81 in steps. now the problem is how to incorporate evaporation at the interface. if any body knows please help me prasanth