[ati_ros61]

hi dears
I want to model a horizontal pipe in Flow-3d with cylindrical mesh block. I have a problem with a definition of gravity. as z-direction is the direction of the pipe, how can I define gravity appropriately?
I applied: non-inertial reference fram=>in "initial gravity" set "y-component" as "-9.81"
but doesn't work

[thunde47]

In cylindrical coordinates, the axes are r, theta, and z. If you apply gravity in the y-direction, the solver will, in fact, apply it in the theta direction. What that means is that you will end up applying angular acceleration causing Euler forces instead of gravitational force.

In cylindrical coordinates, it makes sense to apply gravity in the z-direction. If your pipe's orientation requires gravity to be applied in some other direction, please use cartesian coordinates.

[MartinOVGU]

Originally Posted by ati_ros61

hi dears
I want to model a horizontal pipe in Flow-3d with cylindrical mesh block. I have a problem with a definition of gravity. as z-direction is the direction of the pipe, how can I define gravity appropriately?
I applied: non-inertial reference fram=>in "initial gravity" set "y-component" as "-9.81"
but doesn't work

This should work.
I had similar parameters in a casting process:
Horizontal "pipe" with cylindrical mesh. x-direction marks radius, y- marks theta and z- marks length.




(No values in "shake and spin model")

Worked pretty well. No angular gravity but constant in y-direction...