Openings that are not round or elliptical

Hello BigTank,

You are correct that the circular nozzle at the small end of the transition is a cylinder. It may function for the process as a nozzle but structurally-speaking, per ASME Code, it is a cylindrical shell section.

COMPRESS does not provide for analysis of square or rectangular sections. Sorry.


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Tom Barsh
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options to model these odd openings...

who would approximate the opening area using a round opening? wouldn't the corners of the actual real-life square or rectangular openings cause stress concentrations that would render the approximations invalid?



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wouldn't the corners of the actual real-life square or rectangular openings cause stress concentrations that would render the approximations invalid?

Depends on the corners and depends on the rectangle. For a square opening, or rectangle with a relatively low L to W ratio (2:1 or less), if you have generous corner radii to reduce stress and calculate a circle with a diameter equal to the diagonal distance corner to corner, your AI may go along with it. Since there are no Code rules, you are in U-1(g) and must justify "safe as Code" by whatever means you feel is valid. Of course with rectangular openings if the long dimension is in line with the longitudinal axis and is more than 3 or so times the width, you may have a hard sell without FEA or some serious stress intensifier factors.