Impeller simulation with fluid-structure interaction and deformed mesh

Hello Everybody,

i try to simulate different impeller geometrys and analyse the different resulting fluid velocities.
Therefor i started based on this comsol blog entry:
www.comsol.com/blogs/deformed-...tions-and-linear-translations/

After that i added a Fluid-structure interaction physic node, but i keep getting the error-message:

"Failed to find consistent initial values.
Segregated Step 1
Undefidned variable.
Variable:comp1.fsi.K stress tensor testXY, Geometry: geom1, Boundaries:3,4,6,7
[..]"

But i don't know what to add or what boundary condition is wrongly applied.

This blog entry:
www.comsol.com/blogs/how-to-im...paddle-stroke-with-simulation/

It shows almost what i want to figure out. But i just need the rotating "paddle"

Could you have a look?

thank you and kind regards
Jan