Assessment of turbulence modeling and wake-grid resolution for lift-offset coaxial rotor simulations

Zhongqi Jia, Seongkyu Lee, Kenneth Steven Brentner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This paper examines the impact of wake-grid resolution and turbulence modeling on high-speed steady forward flight simulations of a modern lift-offset coaxial rotor XH-59A. The structured near-body grids are constructed using OVERGRID, and high-fidelity CFD/CSD loose coupling is achieved using the CREATE™-AV software Helios and rotorcraft comprehensive analysis code RCAS. Acoustic results are simulated based on high-fidelity CFD/CSD results and the acoustic software PSU-WOPWOP. The sensitivity of turbulence modeling and wake-grid resolution on nondimensional airloads and acoustics is studied based on four cases: SA-RANS with ∆finest= 10% CtipSA-DES with ∆finest= 10% CtipSA-DDES with ∆finest= 10% Ctipand SA-DES with ∆finest= 5% CtipNo significant discrepancy in airloads and acoustic predictions is shown between the different turbulence modeling cases at the forward flight speeds: 100, 150, and 200 knots. However, the SA-DES model with finest Cartesian spacing equal to 5% Ctippredicted slightly higher magnitude of airloads and acoustic pressure peaks than the same model with 10% Ctipspacing especially at high-speed. An increase of BVISPL up to 4 dB is detected with finer wake-grid spacing.

Original languageEnglish (US)
Title of host publication2018 Applied Aerodynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105593
DOIs
StatePublished - Jan 1 2018
Event36th AIAA Applied Aerodynamics Conference, 2018 - [state] GA, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name2018 Applied Aerodynamics Conference

Other

Other36th AIAA Applied Aerodynamics Conference, 2018
CountryUnited States
City[state] GA
Period6/25/186/29/18

Fingerprint

Turbulence
Rotors
Acoustics
Computational fluid dynamics

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering

Cite this

Jia, Z., Lee, S., & Brentner, K. S. (2018). Assessment of turbulence modeling and wake-grid resolution for lift-offset coaxial rotor simulations. In 2018 Applied Aerodynamics Conference [AIAA 2018-4120] (2018 Applied Aerodynamics Conference). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2018-4120
Jia, Zhongqi ; Lee, Seongkyu ; Brentner, Kenneth Steven. / Assessment of turbulence modeling and wake-grid resolution for lift-offset coaxial rotor simulations. 2018 Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (2018 Applied Aerodynamics Conference).
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abstract = "This paper examines the impact of wake-grid resolution and turbulence modeling on high-speed steady forward flight simulations of a modern lift-offset coaxial rotor XH-59A. The structured near-body grids are constructed using OVERGRID, and high-fidelity CFD/CSD loose coupling is achieved using the CREATE™-AV software Helios and rotorcraft comprehensive analysis code RCAS. Acoustic results are simulated based on high-fidelity CFD/CSD results and the acoustic software PSU-WOPWOP. The sensitivity of turbulence modeling and wake-grid resolution on nondimensional airloads and acoustics is studied based on four cases: SA-RANS with ∆finest= 10{\%} CtipSA-DES with ∆finest= 10{\%} CtipSA-DDES with ∆finest= 10{\%} Ctipand SA-DES with ∆finest= 5{\%} CtipNo significant discrepancy in airloads and acoustic predictions is shown between the different turbulence modeling cases at the forward flight speeds: 100, 150, and 200 knots. However, the SA-DES model with finest Cartesian spacing equal to 5{\%} Ctippredicted slightly higher magnitude of airloads and acoustic pressure peaks than the same model with 10{\%} Ctipspacing especially at high-speed. An increase of BVISPL up to 4 dB is detected with finer wake-grid spacing.",
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Jia, Z, Lee, S & Brentner, KS 2018, Assessment of turbulence modeling and wake-grid resolution for lift-offset coaxial rotor simulations. in 2018 Applied Aerodynamics Conference., AIAA 2018-4120, 2018 Applied Aerodynamics Conference, American Institute of Aeronautics and Astronautics Inc, AIAA, 36th AIAA Applied Aerodynamics Conference, 2018, [state] GA, United States, 6/25/18. https://doi.org/10.2514/6.2018-4120

Assessment of turbulence modeling and wake-grid resolution for lift-offset coaxial rotor simulations. / Jia, Zhongqi; Lee, Seongkyu; Brentner, Kenneth Steven.

2018 Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. AIAA 2018-4120 (2018 Applied Aerodynamics Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - This paper examines the impact of wake-grid resolution and turbulence modeling on high-speed steady forward flight simulations of a modern lift-offset coaxial rotor XH-59A. The structured near-body grids are constructed using OVERGRID, and high-fidelity CFD/CSD loose coupling is achieved using the CREATE™-AV software Helios and rotorcraft comprehensive analysis code RCAS. Acoustic results are simulated based on high-fidelity CFD/CSD results and the acoustic software PSU-WOPWOP. The sensitivity of turbulence modeling and wake-grid resolution on nondimensional airloads and acoustics is studied based on four cases: SA-RANS with ∆finest= 10% CtipSA-DES with ∆finest= 10% CtipSA-DDES with ∆finest= 10% Ctipand SA-DES with ∆finest= 5% CtipNo significant discrepancy in airloads and acoustic predictions is shown between the different turbulence modeling cases at the forward flight speeds: 100, 150, and 200 knots. However, the SA-DES model with finest Cartesian spacing equal to 5% Ctippredicted slightly higher magnitude of airloads and acoustic pressure peaks than the same model with 10% Ctipspacing especially at high-speed. An increase of BVISPL up to 4 dB is detected with finer wake-grid spacing.

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Jia Z, Lee S, Brentner KS. Assessment of turbulence modeling and wake-grid resolution for lift-offset coaxial rotor simulations. In 2018 Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA. 2018. AIAA 2018-4120. (2018 Applied Aerodynamics Conference). https://doi.org/10.2514/6.2018-4120