[PDF] Top 20 Efficient simulation of internal multiscale gas flows

... a simulation where scale separation is not exploited) of at least five orders of magnitude: a saving that allows for the solution of problems that would otherwise not be possible using a non-hybrid ... See full document

... rarefied gas flow in a micro capillary. The multiscale simulation results are in very close agreement with the experimental data, but are produced almost 50,000 times faster than from a ... See full document

... To solve Eq.(16), various numerical schemes can be used. For instance, if the first-order upwind finite differ- ence scheme is chosen, one can obtain the standard form of LB model, i.e., the stream-collision mechanism. How- ... See full document

... dilute gas flows that couples a continuum-fluid description to the direct simulation Monte Carlo (DSMC) ...dilute gas flows, where the coupling is performed through the computed heat ... See full document

... dilute gas flows that lie in the continuum-transition ...and internal state as they move through a computational ...a simulation, the particles collide with each other and with bounding surfaces while ... See full document

... IMM simulation, typ- ically, the micro simulations supplies information on the mass flow rate for the macro domain and the macro solver supplies the density and effective pressure gradient at the subdomain ... See full document

... The hybrid solver has been written in OpenFOAM, a C++ toolbox that contains classes for creating computational fluid dynamics solvers and, recently, also MD solvers (Macpherson & Reese 2008; Ritos et al. 2013). The ... See full document

... rarefied gas flows. Compared with the direct simulation Monte Carlo (DSMC) method, the Langevin method is more efficient in simulating small Knudsen number ...Langevin simulation to ... See full document

... Molecular dynamics (MD) simulations calculate the inter- molecular forces between molecules (based on their configura- tion in space) and then integrate the classical equations of mo- tion using the net force on each ... See full document

... Direct Simulation Monte Carlo method (DSMC) and direct numerical simulation of the Boltzmann equa- tion are too computationally expensive and impractical for applications where the microscopic details are ... See full document

... The hybrid solver has been written in OpenFOAM, a C++ toolbox that contains classes for creating computational fluid dynamics solvers and, recently, also MD solvers (Macpherson & Reese 2008; Ritos et al. 2013). The ... See full document

... any multiscale scheme, such as ...rarefied flows, it is necessary to assess the modeling error introduced whenever it is ...For simulation efficiency, the continuum solver should be deployed in the ... See full document

... the internal-flow multiscale method (IMM) has been developed [28] (see ...exploitable multiscale feature of this type of flow configuration is the existence of length-scale separation between ... See full document

... In this section, we apply the IMM to determine whether a greater pressure drop can be achieved by altering the temperature distribution, whilst maintaining the same total temperature drop. For the purposes of this ... See full document

... In this paper we extend the IMM to compressible fluids and dilute gas flows. A substantial modification to the method- ology is needed in order to account for fluid compressibility, and to capture streamwise ... See full document

... For these kinetic models, beads are considered as mass points, rods are massless and have a fixed length, and the pendant hydrogen atoms are reduced for sim- plicity. Generally, BRS models are divided into two basic ... See full document

... The internal-flow multiscale method (IMM) (Borg et ...a simulation of the entire ...more efficient and ...steady-state flows, because the simu- lations require long averaging periods to ... See full document

... functions of ideal flow parameters ( φ,ψ) over the whole domain. Hence, there is no truncation error as compared with traditional numerical methods. Since the pressure distribution of ideal flow and boundary layer flow ... See full document

... Song{ treated the problem of the supercavitating hydrofoil oscillating under the free surface, and later extended his analysis S to a supercavitating flat plate with an oscillating flap[r] ... See full document

... Piping systems can be lengthy. It can be of different cross-section also. In such cases, the system is broken down into small units and considered as beam elements. Also if the system has bends within its length, ... See full document