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Pressure as a function of coordinates

Pressure as a function of coordinates

Pressure as a function of coordinates

(OP)
Is there a straight forward way of varying a pressure or force in workbench mechanical such that the pressure/force is described by an equation containing one or two spacial coordinates?

I can put in a normal pressure as a function of one of x, y or z, but I want a normal pressure as a function of y and x (theta) and a 'shear' pressure as a function of z. Seems like a normal pressure containing more than 1 coordinate doesn't work, and other pressures won't work with any coordinate variables.

Am I missing something obvious here?

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