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# Far-Field Boundary Condition Effects of CFD and Free-Wake Coupling Analysis for Helicopter Rotor

[+] Author and Article Information
Seong Yong Wie

Department of Aerospace Engineering, KAIST, Daejeon 305-701, Republic of Koreawsy278@kaist.ac.kr

Jae Hoon Lee

Aerospace Division, Koreanair, Daejeon 305-811, Republic of Koreajaehun.lee@gmail.com

Jang Hyuk Kwon

Department of Aerospace Engineering, KAIST, Daejeon 305-701, Republic of Koreajhkwon@kaist.ac.kr

Duck Joo Lee

Department of Aerospace Engineering, KAIST, Daejeon 305-701, Republic of Koreadjlee@kaist.ac.kr

J. Fluids Eng 132(8), 084501 (Aug 16, 2010) (6 pages) doi:10.1115/1.4002110 History: Received June 05, 2009; Revised June 29, 2010; Published August 16, 2010; Online August 16, 2010

## Abstract

Rotor aerodynamics is governed by wake geometry and strength. However, rotor wake characteristics computed by the rotor computational fluid dynamics are not clearly described due to numerical dissipation. To overcome this numerical problem, free-wake is used for wake simulation. The present free-wake describes the inboard vortices as well as the tip vortices of the blade. At each time step, the free-wake provides inflow and outflow conditions of the boundary of the Eulerian domain, and the Euler solver is used for solving the flow field near the rotor blade. Finally, the coupled method is compared with the conventional method and the experimental results.

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## Figures

Figure 1

Schematic of trailed and bound vortices

Figure 11

Pressure coefficients (grid size: 1.8R disk and Mtip=0.877): (a) r/R=0.68, (b) r/R=0.89, and (c) r/R=0.96

Figure 10

Pressure coefficients (grid size: 1.8R disk and Mtip=0.439): (a) r/R=0.68, (b) r/R=0.89, and (c) r/R=0.96

Figure 9

1.8R-disk grid

Figure 8

Pressure coefficients (grid size: 1.8R and Mtip=0.877): (a) r/R=0.68, (b) r/R=0.89, and (c) r/R=0.96

Figure 7

Pressure coefficients (grid size: 1.8R and Mtip=0.439): (a) r/R=0.68, (b) r/R=0.89, and (c) r/R=0.96

Figure 6

Pressure coefficients (grid size: 5R and Mtip=0.877): (a) r/R=0.68, (b) r/R=0.89, and (c) r/R=0.96

Figure 5

Pressure coefficients (grid size: 5R and Mtip=0.439): (a) r/R=0.68, (b) r/R=0.89, and (c) r/R=0.96

Figure 4

Grid system (grid size: 5R and 1.8R)

Figure 3

Procedure of tightly coupled method

Figure 2

Free-wake in the CFD domain

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