Prediction of HART II Rotor BVI Loading and Wake System Using CFD/CSD Loose Coupling

Lim, Joon W.; Strawn, Roger C.

doi:10.2514/6.2007-1281

Cited by 14 publications

(20 citation statements)

References 2 publications

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“…The tip vortex is strengthened at a position just behind the tip as the blade tip passes through from 3 rd to 1 st quadrants of the rotor disk, whereas the tip vortex is weakened in the 2 nd quadrant. This phenomenon can be seen in visualizations in references [11,14]. The vortices in the 2 nd quadrant do not collide with a blade, as seen in Fig.…”

Section: Airload Predictionmentioning

confidence: 64%

“…Brown et al [8,9] applied the vorticity transport model (VTM) to separate vorticity transport from the numerical dissipation of any Navier-Stokes solver. Higher order spatial discretization schemes and huge numbers of grid points have been exploited in order to prevent rapid dissipation of rotor wakes [10][11][12][13]. The computational results reported in these studies generally showed that vortex trajectories and BVI airloads are predicted well with a background-grid spacing smaller than 0.05 chord length.…”

Section: Introductionmentioning

confidence: 67%

“…Dispersion of vortices was explained as a result of the inevitable numerical dissipation. From HART II experiments [2,3] and figures of high resolution [11,13], the tip vortex strengthens at a position just behind the tip as the blade tip passes through the 3rd to 1st quadrant of the rotor disk, whereas the tip vortex weakens in the 2nd quadrant. The vortices do not collide with a blade, as seen in the airload distribution over the rotor disk.…”

Section: Introductionmentioning

confidence: 99%

“…Note that a HART II particle image velocimetry (PIV) experiment shows that the tip vortex has a radius of about 0.05 chord length [3]. For HART II validation, higher order schemes and a grid spacing smaller than 0.05 chord length in the background mesh are recommended to capture rotor vortices, when an overlapping grid system is applied [11].…”

Section: Introductionmentioning

confidence: 99%

“…Visualizations of HART II rotor vortex trailers [5,11,13] show details of the blade-vortex interactions. Dispersion of vortices was explained as a result of the inevitable numerical dissipation.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

KFLOW Results of Airloads on HART-II Rotor Blades with Prescribed Blade Deformation

Hwan¹,

Kim²,

Park³

et al. 2009

International Journal of Aeronautical and Space Sciences

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A three-dimensional compressible Navier-Stokes solver, KFLOW, using overlapped grids has recently been developed to simulate unsteady flow phenomena over helicopter rotor blades. The blade-vortex interaction is predicted for a descending flight using measured blade deformation data. The effects of computational grid resolution and azimuth angle increments on airloads were examined, and computed airloads and vortex trajectories were compared with HART-II wind tunnel data. The current method predicts the BVI phenomena of blade airloads reasonably well. It is found from the present study that a peculiar distribution of vorticity of tip vortices in an approximate azimuth angle range of 90 to 180 degrees can be explained by physics of the shear-layer interaction as well as the dissipation of numerical schemes.

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Section: Airload Predictionmentioning

confidence: 64%