I want to set up a multiphase simulation. To set the initial phase distribution you may use the geometric primitives, but when I add them to the test object its hard put them in the right place. Is their origin of the coordinate system the same as from the model or how does this work? I use a cartesian box and my min and max numbers seem to be random.

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@hendrikbaeumle, the origin of the cartesian box corresponds to the (0,0,0) point in your CAD model so the location of the primitive will depend on where you have this origin set. You can adjust the location of the origin directly in your CAD model and then re-upload the geometry to the platform which should make things seem less random.