Momentum, heat and mass transfer simulations of bounded dense mono-dispersed gas-particle systems

Abstract

Particle Resolved Direct Numerical Simulation (PR-DNS) is employed to study momentum, heat and mass transfer in confined gas-particle suspensions. In this work, we show that the presence of wall boundaries induces an inhomogeneous particle distribution, and as a consequence continuous phase fields exhibit peculiar profiles in the wall-normal direction. Therefore, we first propose a correlation for the particle volume fraction as a function of the distance from the wall and the bulk particle concentration. Secondly, we quantify wall effects on flow field and interphase transfer coefficients (i.e., the flow field, a scalar field, as well as the Nusselt number and drag coefficient). We show that these effects do not depend significantly on the Reynolds number in case an appropriate scaling is applied. Finally, we propose correlations to reconstruct the continuous phase fields in the proximity of adiabatic walls. Also, we provide interpolation tables for the correction to the drag force and the Nusselt number that are helpful in unresolved Euler-Lagrange simulations.

Development of CFD Solver for Four-Way Coupled Particle-Laden Flows

“…[7] and references therein. Our implementation is strongly based on the works of Patankar et al [12], Blais et al [2] and Municchi and Radl [9,10] and it falls into the category of hybrid fictitious domain-immersed boundary methods with a semi-implicit evaluation of a forcing term (HFDIB).…”

“…In this work, we present a new hybrid approach solver to simulate fully coupled particle-laden flows with individual particles spanning multiple domain discretization elements. The solid bodies are included into the computational domain via a hybrid FD-IB (HFDIB) method built based on previous works by Patankar et al [12], Blais et al [2] and Municchi and Radl [9,10]. In particular, the physical movement of fluid in the vicinity of the solid bodies is enforced via a direct forcing term included in the momentum balance.…”

“…The forcing term is designed to be directly incorporated in the standard PISO-like CFD algorithms and the overall solution method remains semi-implicit. Furthermore, similarly to Blais et al [2] and Municchi and Radl [9,10] our method is implemented in OpenFOAM [11].…”

Macroscopic models for filtration and heterogeneous reactions in porous media

“…While we restricted our numerical investigation to FCC configurations, the presented methodology and numerical code can be seamlessly extended to any other geometry. In future works, we plan to use this method to study heterogeneous bulk reactions also at the macroscale, as well as heat/mass transfer in grain packings and suspensions [40,43]. Since the method relies only on stationary cell problems, it is also particularly suitable for computing statistics of random porous media [19].…”

A direct forcing immersed boundary method for cavitating flows

“…Immersed boundary methods have been used to cover a wide range of applications and flow regimes. Examples include (but are not limited to) the work of Borazjani et al, [18][19][20] who used a ghost-cell approach to simulate the moderate Reynolds (Re ≃ 6000) flow through mechanical heart valves; Luo et al 21 utilized a ghost-cell method in cases of incompressible flows with heat-exchange; Uhlmann 14 employed a direct forcing approach on incompressible flows with particles; Municchi and Radl 25,26 studied momentum, heat and mass transfer of gas-particle suspensions with a hybrid of direct forcing and fictitious domain (FD) methods; discrete forcing methods were applied by Blais et al 15 on incompressible viscous mixing and by Mochel et al 16 on compressible high Re flow around a space launcher, using zonal detached-Eddy simulations (ZDES); Fadlun et al 13 and Cristallo and Verzicco 27 made use of direct forcing IB methods to perform large Eddy simulation (LES) of the high Reynolds flow in an internal combustion (IC) engine's cylinder with a moving piston; Arienti and Sussman 28 studied the incompressible flow through a diesel injector nozzle, with the aid of a level-set cut-cell Cartesian grid solver; Pasquariello et al 24 combined a compressible cut-cell fluid solver with a finite-element structural solver to study fluid structure interaction (FSI) problems of shock wave interactions with deformable thin structures. However, to the best of the authors' knowledge, a handful of computational works employ IB approaches on cavitating flows.…”