Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session F25: Multiphase Flows: Compressible Multiphase Flows |
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Chair: Kyle Hanquist, University of Arizona Room: North 225 AB |
Sunday, November 21, 2021 5:25PM - 5:38PM |
F25.00001: Simulation of detonation-driven particle motion employing the compressible MRG force model -- comparison against microscale experiments Joshua R Garno, Jacob M Behrendt, S Balachandar Recent work in the high-speed, multiphase flow community has demonstrated the predictive aptitude of the compressible Maxey-Riley-Gatignol (C-MRG) force model for problems of shock-particle interaction. High-quality data from an explosive, multiphase flow experiment permits an exploration of the model’s accuracy in the detonation-driven flow regime. Calibrated explosive model parameters from a UQ-driven flow study afford a time-dependent simulation flow field that agrees with experimental measurements. Finite-volume, Euler-Lagrange simulations employing the Faxén form of the particle force model are performed, where spatial and temporal variations of flow properties on the scale of the particle are considered. The explosion-induced motion of a few tungsten particles is captured by precisely timed X-ray exposures, and compared with simulation results for evaluation of the accuracy of the force model. |
Sunday, November 21, 2021 5:38PM - 5:51PM |
F25.00002: Numerical Simulations of High Speed, Reacting, Multiphase Flows Benjamin J Musick, Manoj Paudel, Jacob A McFarland, Praveen K Ramaprabhu, Prashant Tarey While gaseous detonations are well studied and documented by the scientific community, detonations propagating through liquid fogs and sprays of fuel are less understood. Multiphase detonations develop characteristics that are more complicated to predict than single phase reactions. Newer technologies such as Pulse and Rotating Detonation Engines (PDE and RDE) aim to utilize common liquid propellants and drive a need to understand the multiphase detonation process better. This presentation will focus on the numerical results of liquid spray detonations with a primary focus on n-dodecane as a fuel. The effects of droplet sizes, distributions, evaporation, and breakup will be discussed in detail. The multiphase results will be compared to data from idealized, single phase simulations and results from other simulation codes. The software used to generate this data is the FLASH code, in part developed by the Flash Center at the University of Chicago, and modified for this problem to include an induction parameter model for single step reactions and active, Lagrangian particles using the Particle-in-Cell (PIC) method. |
Sunday, November 21, 2021 5:51PM - 6:04PM |
F25.00003: Assessment of low-speed mixing and diffusion models for detonating compressible turbulence Hyejin Oh, Foluso Ladeinde The motivation for the present study is the relevance to supersonic spray combustion, such as in scramjet engines where the fuels are used in the liquid state. The evaluation of various drag, heat, and mass transfer models for two-phase high-speed flows is undertaken in this study. Several models for hydrodynamic drag coefficient in high-speed flows are introduced and four nonlinear first order differential equations appropriate for supersonic flows that carry particles are numerically solved to examine the comparative effects of the drag models. A preliminary study on a constant-area nozzle shows the differences in the performance of the drag models as a function of the Reynolds number and the Mach number. The particle velocity, time-of-flight of the particle, and the variation of the flow variables along the nozzle will be reported. The drag models give comparable results for some quantities, except one model which shows a significantly different result for intermediate Mach numbers (1.0 ≤ Ma ≤ 1.7). |
Sunday, November 21, 2021 6:04PM - 6:17PM |
F25.00004: Unsteady Compressible Pairwaise Interaction Extended Point-Particle model Smyther Hsiao, S Balachandar An efficient means to compute multiphase flow problems is to utilize the Euler-Lagrange simulation method. Various developments have been made for the case in the incompressible regime using the pairwise interaction extended point-particle (PIEP) model. The current work extends the PIEP model to cope with the unsteady nature of compressible multiphase flows. A framework is developed using acoustic wave solution and compressible Maxey-Riley-Gatignol equation to predict unsteady secondary forces on a sphere under the influence of a scattering sphere nearby. A case with two spheres while a weak shock passes through is studied. The model is capable of capturing the arrival timing of the scattered signal. Comparisons are made with the force prediction from a particle resolved 2-sphere unsteady simulation. |
Sunday, November 21, 2021 6:17PM - 6:30PM |
F25.00005: Evaporation and Break-up effect in a Shock Driven Multiphase Instability Vasco O Duke |
Sunday, November 21, 2021 6:30PM - 6:43PM |
F25.00006: A pressure-based diffuse-interface method for two-phase flows with mass transfer Andreas Demou, Nicolo' Scapin, Marica Pelanti, Luca Brandt We present a pressure-based method for the numerical solution of a four-equation two-phase compressible flow model with mass transfer. The model assumes kinetic, mechanical and thermal equilibrium and it is composed of the equations for the volume fraction, temperature, velocity and pressure. It includes the effects of viscosity, surface tension, thermal conductivity and gravity. Mass transfer is modeled through a Gibbs free energy relaxation term. A key feature of the proposed pressure-based methodology for the model system solution is the use of high performance and scalable solvers for the solution of the Helmholtz equation for the pressure, which drastically reduces the computational cost. Several numerical tests are presented to demonstrate the effectiveness of the proposed method, including tests involving flows with large density ratios, flows at low Mach number, and a challenging three-dimensional nucleate boiling simulation. |
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