MixedMode is a circuit simulator that includes physically-based devices in addition to compact analytical models. Physically-based devices are used when accurate compact models do not exist, or when devices that play a critical role must be simulated with very high accuracy. The physically-based devices may be simulated using any combination of Atlas 2D modules. The physically-based devices are placed along side a circuit description that conforms to SPICE netlist format. The applications of MixedMode include power circuits, high performance digital circuits, precision analog circuits, high-frequency circuits, thin film transistor circuits, and optoelectronic circuits.
please refer to the attachments if it is helpful for you.
I think its not possible because cylinderical mesh is in 3D and need angular coordinates also combination of circular and rectagular mesh is not possible because the whole mesh should be continuous. But what you exactly wanted to do perhaps there would be some other way to accomplish you goal..