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How to Choose between Rotating Zone and Rotating Wall?


How to choose between rotating zones and rotating walls? This article describes what to choose for different scenarios.


The following chart gives an overview over the current possible options to simulate motion in SimScale:

options for the simulation of motion in simscale
Options for motion in SimScale

Wall Boundary Condition

Under the boundary condition wall you can choose between different options, such as moving wall and rotating wall.

wall boundary condition simscale
Wall Boundary Condition

A) Moving Wall

Moving wall can be applied for flat surfaces which has a movement that translates. You would choose this e.g. when you want to simulate a vehicle driving on a street:

moving wall application on a street simscale
Moving wall boundary condition

B) Rotating Wall

Rotating walls can be applied to cylindrical surfaces which rotate:

rotating wall application simscale
Rotating wall boundary condition

This is only valid for cylindrical surfaces.

Rotating Zone

Rotating zones can be found under advanced concepts. Here you can choose between AMI and MRF. For transient simulations you need to select AMI and for steady state MRF. This document provides more technical background regarding rotating zones.

where to find rotating zones setup in simscale
Find rotating zones in the setup


You select MRF if you have a geometry, that is not symmetric. Here you will have rotation for the whole mesh inside the rotating zone.

rotating zone covering everything that is supposed to rotate
Rotating zone covering everything that is supposed to rotate

You normally need a rotating zone for simulating pumps, turbines or fans.


If none of the above suggestions solved your problem, then please post the issue on our forum or contact us.

Last updated: July 7th, 2020

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