The numerical simulation of droplet impingement at high Mach numbers is a challenging problem, involving wide range physical mechanisms, including material and flow discontinuities, interfacial instabilities, phase change, turbulence. Diffuse interface multiphase methods provide simple, computationally efficient, numerically robust approach to model these phenomena. In this work, higher-order solution procedure for the Allaire five-equation used within in-house solver CHAMPS (previously...

In this paper, aerobreakup in the stagnation region of high-Mach-number flow over a bluff body is studied with experiments and computations. Water drops diameter 0.51–2.30 mm were acoustically levitated at sea level along flight path rectangular $100\ {\rm mm} \times 150\ mm}$ rail-gun launched projectile. This enabled study high Mach (3.03–5.12), post-shock (1.5–1.9), Weber $(5 10^4\unicode{x2013}4 10^5)$ Reynolds $(6 10^4\unicode{x2013}3 numbers. High-speed backlit shadowgraphy used to...

In this study a peridynamics approach is used in combination with higher-order computational fluid dynamics to predict deformation of ductile metallic target due water droplet impact. The simulates the droplet-shock interaction and provides distorted shape prior converted peridynamic grid impact event simulated. For droplets, material model conjunction equation state used. target, Johnson-Cook crater depth predictions agree theoretical curve constructed based on an experimental target....

Atmospheric droplets may collide with high-speed vehicle surfaces during flight and lead to complex droplet-structure interactions. To analyze these interactions, a two-phase fluid dynamics solver is coupled peridynamics based structural using sharp interface immersed boundary method. This integrated approach first validated for an elastic fluid-structure interaction problem, then applied investigate the impact of axisymmetric at Mach numbers ranging from 1 4. The study investigates one-way...

View Video Presentation: https://doi.org/10.2514/6.2023-4251.vid Droplet simulations with and without phase change have been performed to further our understanding of the relevant physics involved in aerobreakup impingement water droplets at hypersonic flow speeds large Weber numbers. The numerical are conducted closely following light-gas gun experiments Southwest Research Institute. A robust higher-order WENO-based multiphase method is used assumption thermo-chemical equilibrium...

View Video Presentation: https://doi.org/10.2514/6.2023-4250.vid Multiphase flows occurring at high speeds are relevant to many aerospace applications including reentry of space capsules, degradation orbital debris, and rocket combustion. This work details the development a computational framework capture complex, novel flow features that occur in multiphase when there temperature gradients between fluid phases, fluids change phases based on local thermodynamic conditions. A...

View Video Presentation: https://doi.org/10.2514/6.2022-3922.vid High-speed droplet impingement is a challenging problem involving wide variety of physical mechanisms, including aero-breakup and phase change. Diffuse interface multiphase methods provide simple, computationally efficient, numerically robust approach to model these phenomena. In this work, high-order numerical solution procedure for the Allaire five-equation within in-house solver CHAMPS validated against currently available...

We present Large Eddy Simulations and aeroacoustic spectra for three configurations of increasing flow complexity: an isolated NACA0012 airfoil, rotating vertical axis wind turbine composed airfoils a farm four turbines (with identical characteristics as the turbine), which are located in close proximity. The signatures simulated airfoil validated using published numerical experimental data. provide theoretical estimates to predict tonal frequencies, used identify main physical mechanisms...

Hypervelocity water entry of a projectile through free surface is an important problem with little available experimental data in the literature and largely unvalidated numerical techniques. In preparation for planned campaign using spherical projectiles, this study examines novel approach implemented CFD code CHAMPS by comparing it to existing studies. The shock front depth was well captured when compared image, but there disagreement depth. comparison previous studies, evolution peak...

In this study, a high-speed water droplet impact problem is investigated in sequential manner. A high-order computational fluid dynamics (CFD) solver used to compute transient pressure signature caused by normal and oblique impacts of droplets including the interaction between shock layer droplets. Distorted shapes are tracked as well pressures for different grid resolutions. Impact from CFD transferred peridynamic body force density boundary conditions predict deformation response ductile...