Nicolas Reveles

Optimization Using Analytic Sensitivities Derived from an Advanced Coupling Framework: Applications to Rotor Blade Twist

Josh Hansen, Nicolas Reveles

An advanced coupling framework was leveraged to assemble analytic sensitivities of lifting line theory aerodynamic loads with respect to externally-defined blade geometry parameters for optimization of main rotor performance of conventional helicopter configurations. Three vehicle weights and two flat-plate-equivalent drag configurations were …

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Synthesis of Whirl Flutter Predictions from Multiple Independent Analysis Solvers

Nicolas Reveles, Christopher Van Damme, Joseph Robinson, Matthew Tuman et autres

A new approach that enables the synthesis of fully coupled system dynamics is described in this paper. The approach facilitates collaboration between solver developers by explicitly avoiding inter-code coupling and instead uses a generic interface that enables inputs to be set and …

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An Indirect Stability Method Applied to Whirl Flutter using Computational Fluid Dynamics Actuator Disc Models

Nicolas Reveles

A recently developed indirect eigenvalue method is applied to propeller whirl flutter stability using computational fluid dynamics. The use of computationally efficient actuator disc models is compared to actuator blade and wall-resolved models. Actuator disc and blade results are confirmed to be …

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Hermes: A Generic Coupling Framework with Applications to Rotor Aeromechanics

Nicolas Reveles, Joseph McCauley, Eric Blades, Joseph Robinson et autres

A highly extensible coupling framework for analysis of complex systems called Hermes is introduced. An overview of how the coupling framework functions is provided along with a description of a selection of relevant solver modules available for use within Hermes. The application …

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Development of a New Stability Method with Applications to Rotary Wing

Nicolas Reveles, Anurag Rajagopal, Joseph McCauley, Eric Blades

A new stability approach, termed the indirect eigenvalue method, blends the benefits of a direct eigenvalue approach with the versatility of time-marching schemes commonly used by high-fidelity methods such as computational fluid dynamics (CFD). The indirect method relies on an accurate estimate …

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Application of a Novel Stability Method to CFD-Based Whirl Flutter Analysis

Nicolas Reveles, Anurag Rajagopal

This paper documents how a newly developed stability method that indirectly computes eigenvalues from known eigenvectors is able to leverage computational fluid dynamics (CFD) results to predict whirl flutter for a simple propeller experiment. The stability method can incorporate nonlinear computational fluid …

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Study of Rotor-Jetpack-Wind Aerodynamic Interaction for Mid-Air Helicopter Delivery on Mars

Marcel Veismann, Jan Raffel, Malicia Leipold, Julius Wanner et autres

Mid-Air Helicopter Delivery (MAHD) is a new Entry, Descent and Landing (EDL) architecture for enabling future Martian helicopter-only missions (e.g., Mars Science Helicopter (MSH)), that offer much greater in situ mobility compared to traditional rover missions at lower cost. This EDL concept …

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A Generalized Methodology for a Highly Parallelizable Uncoupled Method for Static Aeroelastic Analysis in Support of Design Optimization

William D. Scholten, Nicolas Reveles, Eric L. Blades

View Video Presentation: https://doi.org/10.2514/6.2023-0328.vid Incorporation of static equilibrium aereoelastic deformations into the design phase of a vehicle platform would result in a final design that is holistically closer to optimal from a weight and performance perspective than neglecting these effects and potentially …

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The Rotorcraft Aerodynamics Library: A Modelica Library forSimulation of Rotorcraft Aerodynamics and Whirl Flutter

Cory J. Rupp, Nicolas Reveles

Rotor aeromechanics is a multidisciplinary branch in the field of rotorcraft that involves performance, loads, vibrations, stability, and noise.Aeromechanic analysis in this field is a complex task typically requiring specialized software tools to simultaneously resolve the coupled structural, mechanical, and aerodynamic solutions …

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Comparisons of Fully Coupled Aeroelastic Fuselage Simulations to UH-60A Airloads Program Data

Nicolas Reveles, Hyeonsoo Yeo, Eric L. Blades, Tyler Pierce

An aeroelastic coupling framework is applied to the UH-60A platform to examine aerodynamic-induced vibrations at four advance ratios spanning the flight envelope. Both one-way and two-way aeroelastic coupling results are examined at each condition. The two-way coupled results are observed to generally …

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Rotor/Propeller Model Fidelity Effects on Propeller-Wing Interactional Aerodynamics

Nicolas Reveles, Kyle Seledic, Darryl Williams, Eric L. Blades et autres

Four computational models of propellers are applied to the Workshop for Integrated Propeller Prediction (WIPP) dataset at Mach 0.08 conditions with a propeller thrust coefficient of 0.40 using the NASA Langley FUN3D solver: a uniform actuator disk, a radially distributed actuator disk, …

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Utilizing Analytic and Direct Methods for the Verification and Validation of Whirl Flutter Analyses

Nicolas Reveles, Joseph D. Schoneman, Cory J. Rupp, Eric L. Blades

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