Multidimensional Calculations for a Two-Stroke-Cycle Engine: A Detailed Scavenging Model Validation

A general mass consistency algorithm for hybrid particle/finite-volume PDF methods

“…This situation arises with non-aligned interfaces [30,31] and solution-adaptive local mesh refinement via element splitting [32], for example. This is accommodated naturally in the present vertex-and face-based mass consistency algorithm, as long as the correct face mass flowrates are provided by the underlying FV solver.…”

“…discretization is first-order in time and up to second-order in space. Additional features that have been implemented to accommodate complex geometry and flow include non-aligned interfaces [30,31] and solution-adaptive local mesh refinement [32]. Available physical models include two-equation turbulence models and a variety of turbulent combustion models.…”

Shape Parameterization and Optimization of a Two-Stroke Engine

“…Haworth et al 5 used a multidimensionalcalculationof scavenging in a loop-scavengedengine to compare the computed mean and rms velocities with laser Doppler velocimetry (LDV) measurements of the same quantitiesin a commerciallyavailableengine under normal engine speed and ow conditions.The geometry model included six transfer ports, cylinder, exhaust duct, and a simpli ed crankcase.…”

“…2 A rst approach to investigate the scavenging of a two-stroke engine can be made with Computational Fluid Dynamics (CFD) for predicting the gas ow in the cylinder. In the past decade CFD has been used extensivelyin this area of research,and severalvalidations of CFD multidimensionalcalculationshave been provided,the most detailed of which are given by Raghunathan and Kenny, 3 Amsden et al 4 and Haworth et al 5 Raghunathan and Kenny 3 used the commercially available software package STAR-CD to simulate the ow in a motored, twoported loop scavenged engine by modeling the transfer duct, cylinder, and exhaust duct. The results indicated that the ow within the cylinder is highly complex and that the scavenging is affected by the reverse ow through the exhaust port.…”

Estudio CFD de la resonancia en la cámara de combustión de Motores Diesel HDI

“…Como en la mayoría de los problemas de acústica lineal, aquí se trata de dar solución a la ecuación general de ondas tridimensional [118]: 65) donde p es la presión en un punto de coordenadas (x, y, z) en el tiempo t. De acuerdo con la teoría modal, la solución de esta ecuación se puede expresar como la suma infinita de modos de propagación axiales (longitudinales) y transversales (radiales o azimutales), dependiendo de la dirección de la propagación de ondas en el cilindro [48,50,161]. Es decir, la presión total en un punto específico del cilindro (r, θ, z) debida a una excitación en un instante dado, se puede expresar como: (2.66) donde J m (k 0rmn r) es la función de Bessel de primera especie y de orden m; k 0 = 2πf c0 es el número de onda;…”