A semi-Lagrangian transport method for kinetic problems with application to dense-to-dilute polydisperse reacting spray flows
For sprays, as described by a kinetic disperse phase model strongly coupled to the Navier–Stokes equations, the resolution strategy is constrained by accuracy objectives, robustness needs, and the computing architecture. In order to leverage the good properties of the Eulerian formalism, we introduce a deterministic particle-based numerical method to solve transport in physical space, which is simple to adapt to the many types of closures and moment systems. The method is inspired by the semi-Lagrangian schemes, developed for Gas Dynamics. We show how semi-Lagrangian formulations are relevant for a disperse phase far from equilibrium and where the particle–particle coupling barely influences the transport; i.e., when particle pressure is negligible. The particle behavior is indeed close to free streaming. The new method uses the assumption of parcel transport and avoids to compute fluxes and their limiters, which makes it robust. It is a deterministic resolution method so that it does not require efforts on statistical convergence, noise control, or post-processing. All couplings are done among data under the form of Eulerian fields, which allows one to use efficient algorithms and to anticipate the computational load. This makes the method both accurate and efficient in the context of parallel computing. After a complete verification of the new transport method on various academic test cases, we demonstrate the overall strategy's ability to solve a strongly-coupled liquid jet with fine spatial resolution and we apply it to the case of high-fidelity Large Eddy Simulation of a dense spray flow. A fuel spray is simulated after atomization at Diesel engine combustion chamber conditions. The large, parallel, strongly coupled computation proves the efficiency of the method for dense, polydisperse, reacting spray flows.
- OSTI ID:
- 22622237
- Journal Information:
- Journal of Computational Physics, Vol. 329; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9991
- Country of Publication:
- United States
- Language:
- English
Similar Records
Assessment of different coarse graining strategies to simulate polydisperse gas-solids flow
Numerical simulation of spray coalescence in an Eulerian framework: Direct quadrature method of moments and multi-fluid method
Related Subjects
GENERAL PHYSICS
ACCURACY
ALGORITHMS
COMBUSTION
COMBUSTION CHAMBERS
COMPUTER ARCHITECTURE
CONVERGENCE
COUPLINGS
EFFICIENCY
EQUILIBRIUM
FUELS
INJECTION
LAGRANGIAN FUNCTION
LARGE-EDDY SIMULATION
LIQUIDS
NAVIER-STOKES EQUATIONS
NOISE
PARTICLES
SPATIAL RESOLUTION
SPRAYS
VERIFICATION