Learning Forum

[peteroznewman]

The CFD model solution provided a complete pressure map for the compressor rotor and a complete pressure map for the turbine rotor. CFD post processing was used to sum the pressure map to compute the forces and moments at each bearing. Having the forces and moments is sufficient to design the bearing and the support structure for the bearing. The forces and moments at the bearing are not the best input to compute the static deflection in the shaft. It will show the deflection of the shaft between the bearings, but does not show the correct deflection of the shaft that overhangs from the bearing to the rotor hub.
A better input for shaft deflection would be to sum the pressure map at the rotor hub. Then when you apply forces and moments at the rotor hub, the shaft bending will include the overhang of the rotor from the bearing.
If you can't get new output from the CFD model, you can use statics to calculate the Force and Moment at the rotor hub and apply those newly calculated values to the shaft vertex at each rotor hub. That will cause deflection in the overhangs.