Hello all

How do you reverse the way Gambit displays r and z directions when you mention AXI-SYMMETRIC in the PROBLEM statement?

I am trying to simulate the heat transfer of fluids in vertical cylindrical tanks. The axis of symmetry is in y direction so it makes sense if 'r' is horizontal and not vertical (which is the default). When I construct the geometry in GAMBIT, i am doing so in cartesian coordinates (x and y) and in the read file for FIDAP (the solver), I specify UX = 0 for the axis of symmetry.

After the computation, r is vertical and z is horizontal. How can I make r horizontal and z vertical?

Please help. If it's not possible in GAMBIT, let me know how to achieve it in FIDAP.

Awaiting replies,

Sridhar

It's not possible, but there is no need for too. You just need to give the rigth direction for the gravity in Fluent (let's say (0, -9.81, 0).

Laika, still orbiting

Hi Laika

Here's a proof that it's possible (in FIDAP atleast):

http://mantis.acomp.usf.edu/fidap/fi.../ex09.htm#ex09

Note the r and z in the Figure 9-1 and in Figure 9-2.

You mentioned that it is not necessary to have r in the horizontal and z in vertical directions. Yes, with the proper mentioning of THETA in GRAVITY command and tilting the geometry of the model itself, I am able to simulate the problem I am doing, but my idea is to know the way how they (in the above example) were able to alter r and z directions.

Hi,

I don't know about Fidap, but in Fluent the axisymmetric solver is programmed as such that the axis of symmetry should be the x-axis. Fluent will calculate correctly, even if your geometry is vertical in reality. You can rotate the view if you want to.

Or have I misunderstood your problem?

Laika, still orbiting