Rotor Wake Computations for Direct Integration with Current CFD Technology

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-09-C-0574
Agency Tracking Number: N09A-009-0309
Amount: $70,000.00
Phase: Phase I
Program: STTR
Awards Year: 2009
Solitcitation Year: 2009
Solitcitation Topic Code: N09-T009
Solitcitation Number: 2009.A
Small Business Information
Cascade Technologies Incorporated
1330 Charleston Road, Mountain View, CA, 94043
Duns: 179576715
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Bono Wasistho
 Senior CFD Engineer
 (650) 691-6064
Business Contact
 Parviz Moin
Title: President
Phone: (650) 224-4882
Research Institution
 Stanford University
 Juan Alonso
 Aero. Astro. Dept.
Stanford, CA, 94305
 (650) 723-9954
 Nonprofit college or university
The technical objective is to develop methodology and tools suitable for the integration of more efficient but accurate rotor wake computations within current unstructured CFD computations. The proposed method avoids the use of computationally intensive full overset rotor computations with attached refined grids to capture and track the blade tip vortex. Instead, we propose a 3 components methodology. First is an enhancement of existing actuator disk models to include an accurate representation of the tip vortex and helical motion in the wake. This is achieved by employing tip vortex strength as additional constraint in modeling the loading distribution on the actuator disk, and by treating the rotor disk as a rotational reference frame. Second and the main ingredient of the methodology is a novel vorticity preserving technique that is fully dynamic, avoiding any tuning parameters, to counter the inherent numerical dissipation. This will allow accurate modeling of the rotor wake dynamic and in turn its interaction with the solid surface of the main body. The third component is the use of a flexible multi codes coupling framework to enable simulations of different rotor models and configurations in a plug and play fashion without specific modifications of the main flow solver.

* information listed above is at the time of submission.

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