An efficient actuating blade model for unsteady rotating system wake simulations

Lynch, C. Eric; Prosser, Daniel; Smith, Marilyn J.

doi:10.1016/j.compfluid.2013.12.014

Cited by 15 publications

(5 citation statements)

References 39 publications

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“…This restriction was eliminated in 2014 by the introduction of a kd-tree search that permitted interpolation during the simulation at a cost negligible compared to the uRANS simulation. The strength and location of the vortex wake was demonstrated to be accurately computed compared with blade-resolved CFD and experiment [30], as illustrated in Fig. 3.…”

Section: Actuator Disks/blades/linesmentioning

confidence: 95%

Dual-solver hybrid computational approaches for design and analysis of vertical lift vehicles

Smith

Moushegian

2021

Aeronaut. j.

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The cost of Reynolds-Averaged Navier-Stokes simulations can be restrictive to implement in aeromechanics design and analysis of vertical lift configurations given the cost to resolve the flow on a mesh sufficient to provide accurate aerodynamic and structural loads. Dual-solver hybrid methods have been developed that resolve the configuration and the near field with the Reynolds-Averaged Navier-Stokes solvers, while the wake is resolved with vorticity-preserving methods that are more cost-effective. These dual-solver approaches can be integrated into an organisation’s workflow to bridge the gap between lower-fidelity methods and the expensive Reynolds-Averaged Navier-Stokes when there are complex physics present. This paper provides an overview of different dual-solver hybrid methods, coupling approaches, and future efforts to expand their capabilities in the areas of novel configurations and operations in constrained and turbulent environments.

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Section: Actuator Disks/blades/linesmentioning

confidence: 95%

Dual-solver hybrid computational approaches for design and analysis of vertical lift vehicles

Smith

Moushegian

2021

Aeronaut. j.

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“…Defining nodes on geometry boundaries as illustrated in Figure , the receptor grid's nodes are activated and localized in the following sequence: Corner nodes: Nodes that coincide with three or more boundaries. A kd‐tree search over only the corner nodes of the background grid can be performed in order to ensure that these few critical points in the domain are successfully localized. Edge nodes: Nodes that coincide with two boundaries. Face nodes: Nodes that coincide with one boundary. Volume nodes: Nodes that do not coincide with any boundary, which comprise the rest of the nodes in the domain.…”

Section: Robustness Features To Overcome Search Failuresmentioning

confidence: 99%

“…The kd‐tree node search method is used when the step limit is encountered. The method identifies the nearest background grid node to the receptor grid node that needs to be localized.…”

Section: Robustness Features To Overcome Search Failuresmentioning

confidence: 99%

“…Noack applied octree based data structures to perform the stencil search for overset interpolation. An improved method using kd‐tree based data structures was demonstrated for actuator blade source interpolation by Lynch et al . Roget and Sitaraman employ an alternating digital tree based data structure for overset interpolation stencil searches.…”

Section: Introductionmentioning

confidence: 99%

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An efficient and robust localization scheme on massively distributed systems

Shenoy

Smith

Park

2014

Numerical Meth Engineering

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A parallel localization scheme is presented to enable solution transfers between unstructured grids. The scheme relies on neighbor walks to reduce the number of candidate elements that are visited to find the enclosing element. An advancing front method efficiently allows a subset of nodes to efficiently sweep through the grid, progressively reducing search spaces. The algorithm is parallelized permitting solution transfers over arbitrary grid decompositions. A hierarchical localization process helps prevent the neighbor walk algorithm from failing when encountering the boundaries of a concave domain by localizing the boundaries before the interior of the domain is localized. Random selections of the next step interrupt cyclic loops that may occur during a neighbor walk. The complexity of the search algorithm is verified over parallel decompositions and is effectively independent of the number of partitions.

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“…Rotor operation over time can be analyzed by mathematical modeling, including simulation based on computational fluid dynamics (CFD) [6][7][8] as well as by experiments on a test stand [9] or in a wind tunnel [10,11]. The CFD method is also widely used in the analysis of steady-state aerodynamic interactions [12] and rotor wake geometry [13,14].…”

Section: Introductionmentioning

confidence: 99%

Numerical calculations of the autorotating rotor under transient conditions

Czyż¹,

Kazimierska²,

Karpiński

et al. 2021

J. Phys.: Conf. Ser.

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It is necessary to evaluate the performance of the main rotor in design stages of a rotorcraft to obtain the assumed lift force and low aerodynamic drag. This paper presents the CFD numerical analysis of the autorotating rotor under transient conditions. Auto-rotation is particularly important in the case of gyrocopters, while in the case of helicopters it is related to flight safety. The calculations allowed us to obtain aerodynamic forces and torque as a function of rotor azimuth for individual rotor blades. The analysis was performed for a rotor tilted by 15 degrees toward the airflow direction. A geometric model was created for the calculations and then a computational model was created in Ansys Fluent software. The k-ω SST model was adopted as the turbulence model which considers the turbulence kinetic energy and its unit dissipation. The obtained results are presented in a rotor and flow coordinate system.

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An efficient actuating blade model for unsteady rotating system wake simulations

Cited by 15 publications

References 39 publications

Dual-solver hybrid computational approaches for design and analysis of vertical lift vehicles

Dual-solver hybrid computational approaches for design and analysis of vertical lift vehicles

An efficient and robust localization scheme on massively distributed systems

Numerical calculations of the autorotating rotor under transient conditions

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