[Roberto_B]

Hi,

I have simulated the filling process of a cylindrical center-perforated tank (internal radius of 50 mm, external radius 80 mm, height 200 mm) with an high viscous fluid.

Considering symmetric characteristics of the domain, I have considered only a portion of the tank circumference (60 degrees) and obviously I have used a cylindrical mesh. I found no relevant problems in configuring and running the simulation.


Actually, I encounter difficulties in post-processing the text output data and in particular in understanding the azimuthal-coordinates Y. What does it represents?


It assumes values that are neither in degrees nor in radians but ranges from about 0 to 0.084 (i.e. of the same size as the X coordinate). Which conversion I have to use to obtain the angular coordinate? No detail is reported in the help content… ABSURD!!!!




Lastly, fluid velocities (u,v,w) reported in text output are expressed in also in cylindrical coordinates or in cartesian ones anyway?

Could anyone explain how Y coordinate must be considered?


Thanks

[jhiggs]

Hi Roberto_B,

X is radius
Y is angle in degrees, it can range from 0 to 360, or 60 in your case.
Z is elevation

Fluid velocities reported as (u,v,w) are cylindrical coordinates
u is r-velocity, or away from center in ft/s or m/s.
v is theta velocity in ft/s or m/s.
w has not changed, z-velocity in ft/s or m/s.

I have yet to try to convert these back to Cartesian. I am wondering if Tecplot or other programs can do that.

Jim

[JBurnham]

Roberto may be using an older version of FLOW-3D. The Text Output has shown the theta (degrees) coordinate of the cell center since v10.1 (I think).

Before that the y-coordinate was shown as the arc length from theta = 0 to the cell center, at maximum distance r (x-max) from the center.

Roberto, you may wish to update your FLOW-3D version.