High-Order Accurate CFD/CSD Simulation of the UH60 Rotor in Forward Flight

Ahmad, Jasim; Chaderjian, Neal M.

doi:10.2514/6.2011-3185

Cited by 11 publications

(12 citation statements)

References 7 publications

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“…Besides the reduction of the maximum, the spread of the high noise area (cf. Figure 14(a) marker (1)) is reduced in the vicinity of the helicopter and mostly downstream, whereas the shape directly in front of the rotor only shows slight differences (2). Notable is the shading by the tailboom in the constriction at the rear with a slight lateral displacement to the starboard (3).…”

Section: Aeroacoustic Influence Of Helicopter Componentsmentioning

confidence: 98%

“…Recently, besides the availability of higher computational resources, numerics have made progress in the field of higher order methods to improve the vortex conservation. Investigations of Boyd [1] and Ahmed [2] already presented the advantage using such numerical methods for helicopter simulations in this flight state. Boyd showed that CFD codes using higher order methods are in principle capable of resolving BVI measured in a wind tunnel experiment.…”

Section: Introductionmentioning

confidence: 99%

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Aeroacoustic Simulation of a Complete H145 Helicopter in Descent Flight

Kowarsch¹,

Öhrle²,

Keßler³

et al. 2016

j am helicopter soc

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In the past years, the aeroacoustic noise emission of a helicopter became one of the most important, but also challenging issues in helicopter development. The blade vortex interaction phenomenon is one of the dominant phenomena characterizing the helicopter's aeroacoustic footprint, which is insufficiently predicted by low fidelity computational methods. For a high fidelity noise prediction of a helicopter configuration, a multidisciplinary CFD-CSD-CAA tool chain has been established at the Institute of Aerodynamics and Gas Dynamics of the University of Stuttgart. With higher order CFD computed noise generation at the near field and the noise convection using a Ffowcs-Williams Hawkings based CAA code, very good agreement to measured aeroacoustic noise in wind tunnel as well as free flight experiments of helicopters is achieved. However, the simulations had been limited to the main rotor's geometry up to now, where some residual deviations to the experiment still exist. In this paper, we present a high fidelity aeroacoustic simulation of a complete helicopter configuration and the benefit compared to an isolated rotor simulation in predicting its aeroacoustic noise emission. Shading and reflection effects are clearly resolved, influencing the behaviour of the helicopter's noise radiation. The simulated aeroacoustic noise emission of the helicopter lies within the experimental variation and shows therefore highly promising results for the next generation of aeroacoustic noise prediction.

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Section: Aeroacoustic Influence Of Helicopter Componentsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Aeroacoustic Simulation of a Complete H145 Helicopter in Descent Flight

Kowarsch¹,

Öhrle²,

Keßler³

et al. 2016

j am helicopter soc

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“…Flight mechanics models can also be coupled with Computational Fluid Dynamics and Acoustic algorithms. Ahmad [14], Datta [15], Rajmohan [16], Quaranta [17] and Brentner [18] worked on these numerical simulations. All these simulations are done in an isolated context that has no dynamic links within service measurements.…”

Section: A Review Of Previous Work On Multibody Simulations Of Helicmentioning

confidence: 99%

Creation of helicopter dynamic systems digital twin using multibody simulations

et al. 2019

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This paper presents a new approach to develop digital twins of helicopter dynamic systems. Helicopter industries attach growing attention to the development of digital twins to be more predictive of mechanical parts lifetime. The number of sensors available to measure loads during flights is limited. Complementary simulations are necessary to compute all the loads that the mechanical parts undergo. A new process is described to build these simulations fed with flights data records. Complexity of helicopters dynamics systems leads to create several local models of subsystems using a multibody dynamic formalism. A study focused on a swashplate rotor assembly is presented to illustrate this approach, including a new model of bearing and its validation based on bench tests.

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“…The object X-rays approach 7 is robust, fast, and has been successfully utilized in moving-body problems. 5,23 However, the inputs require substantial user expertise and effort. It was recognized that many of the steps involved in the object X-rays approach could be automated, and certain details of the algorithm could be improved.…”

Section: Iiia Chimera Components Connectivity Librarymentioning

confidence: 99%

Developments in Strategies and Software Tools for Overset Structured Grid Generation and Connectivity

Chan

2011

20th AIAA Computational Fluid Dynamics Conference

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Recent developments in strategies and software tools for overset structured grid generation and domain connectivity are described. A scripting approach based on a library of grid generation script macros is adopted to speed up the grid generation process. Advances in this method involve the development of high level functions that encapsulate more complex grid generation tasks. Sample applications using the script library macros are given for several complex configurations. Advances towards automated and efficient domain connectivity is accomplished using a newly developed library of domain connectivity functions called Chimera Components Connectivity Library (C3LIB). The library contains standard interfaces to the various processes encountered in domain connectivity. Enhancement to the stencil search speed is accomplished via bounding boxes based on balanced index-space partitions, and replacement of global searches by local searches using space-filling curve segments. The performance of the parallel stencil search algorithm is illustrated via a set of test cases on practical complex configurations. * Computer Scientist, AIAA Senior Member

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High-Order Accurate CFD/CSD Simulation of the UH60 Rotor in Forward Flight

Cited by 11 publications

References 7 publications

Aeroacoustic Simulation of a Complete H145 Helicopter in Descent Flight

Aeroacoustic Simulation of a Complete H145 Helicopter in Descent Flight

Creation of helicopter dynamic systems digital twin using multibody simulations

Developments in Strategies and Software Tools for Overset Structured Grid Generation and Connectivity

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