It seems to me that the latest version of solidworks offers a plastics module. This one proposes to simulate the filling of molds or any other volume by liquid injection. I don't really know the module but I know it exists.
we have a tank with X walls (a tube with horizontal or vertical bottoms is the same)
We have nozzles each nozzle at a dispersion angle
so according to this angle and the position of this nozzle if this nozzle is fixed
We arose in a well-defined place of course with a liquid and an appropriate pressure
so you need X nozzles at different angles and positions to arouse the internal surface of this said tanks
As each nozzle has its own angle of dispersion, all you have to do is create an axis line and create a plane perpendicular to this axis that coincides with the nozzle head
On this plane you create your initial dispersion sketches and via an extrusion to the surface with an angle that takes up the angle of dispersion you will create a kind of cone that you will color in a color different from the color of the inner skin of your tank
then you will just have to make a cut of your tank and look via the displacement of this said cut where the color has not changed and change the orientation or increase the number of nozzles
Some of the internal parts are rotated (in the axis of the tank or not) and others are not.
On the other hand, the idea here is not to know how to install the nozzles (we do it from experience) but to be able to support our positioning by a study + documentation with our customers.