Hello,

there is a part in the fluent manual which says that for an axisymmetric model, we must model such that the axis of rotation is the x axis. What do you mean?

Suppose I have a conical model,must I use a coordinate system such that it is lying along the x -axis. i.e. the centerline cutting through the tip of the cone is parallel to the x axis and not the y-axis, meaning it cannot be an upright cone?

Thanks a lot for anyone who can help.

Juliana P

Your understanding is correct. The centerline cutting through the tip of the cone must be parallel to the x-axis. Don't confuse the y-axis and upright. If you have any gravity-dependent physics, you can always define gravity to act in the -x direction.

Thanks Evan. If you happen to see this post again. Just to reiterate, so any 2Dmodel that is symmetrical about 1 axis, that axis should always be parallel to the x axis rite? Thanks again.

It has to be coincident with the x-axis (not just parallel to it). Evan's right with being able to assign a direction vector to gravity, so "upright" doesn't really have a meaning.

When you're post-processing, you can change the "up-vector" for your images so that they look more realistic. Go to Display->Views, click the "Camera" button, and here you can set the values for what you're looking at. I usually change the Projection to "orthographic". Then in the drop down next to Camera you can select "Up Vector" and define your up vector in the -g direction. In the Views panel you can also make a mirror plane (or reflect about an existing plane). Just a couple notes to help with your post-processing. It's amazing how impressed a boss can be with a pretty picture : )

Hope this helps and good luck, Jason

thanks to Jason too!