Learning Forum

[tk2501]

Hello everybody,

I would like to model a 2D axisymmetric model of a reactor. The reason for this is that the geometry of the 3D model is so complicated that simulation is not possible for various reasons (too many calculation cells for the student version, calculation cells too large, insufficient computer power).

The reactor is approximately 2 m high and has a diameter of 50 mm. Should the height then be plotted along the x-axis or the y-axis?

How else do I need to define the components? I have the inlet, outlet and walls. But what do I do with the line on the x-axis? How do I define it so that the axisymmetric simulation works? Also as a wall or shoud i define nothing?

Thank you!

[NickFL]

I usually have my students work through this example before trying 2D axisymmetric problems: https://innovationspace.ansys.com/courses/courses/turbulent-pipe-flow-rans/lessons/problem-specification-lesson-1-33/ This should demonstrate how to set up the geometry for your problem.

[B D]

Hello,

For axi-symmetric problem, the geometry should be kept in first quadrant, i.e. +ve x and y. You can define x-axis as axis of rotation so you should put the height on x-axis. Once you select "axisymmetric" option in the General settings, the axis surface needs to be selected as "axis" boundary type. This option only comes once you activate the axi-symm. in general settings.