CFD and Moving Geometries

This combination is often a big challenge. Especially if the geometry does not rotate on a fixed axis. These kind of cases can often be approximated by creating a cylinder for an MRF approach. Unfortunately this is not always possible and also requires additional engineering time. At MANTIUMCAE these kind of more complex simulations are done with XFlow.

Here are some examples showcasing how using transient simulations with moving geometries can provide valuable information which could not have been obtained otherwise.

DRS Rear Wing:

Geometry A Geometry B
DRS_geo_A DRS_geo_B
DRS_A_forces DRS_B_forces


A more detailed look at the results shows will reveal more:



Geometry A


Geometry B



Looking at the overall forces shows that this simulation approach helps to understand how long it takes for the wing to create its additional downforce (here Cy) after closing. In this case Wing B is clearly faster. Just using two steady state simulations simulating the opened and closed configuration would not have revealed this.




Flying Car:

Geometry A Geometry B
flying_A_flender flying_B_flender
flying_A_floor flying_B_floor


Car A seems to like going into the air:


MantiumRacer doing a flip


Car B rotates back towards the ground after a short while:



If you are interested in an aerodynamic consulting project possibly containing complex moving geometries, please contact us.