ECOGEN: An open-source tool for multiphase, compressible, multiphysics flows

Abstract

This paper presents a new multiphase flow code, cast under an open-source GNU license. The main characteristics of the different flow models are given, then the numerical method used is briefly presented: it includes temporal flow solvers, meshing features (like AMR technics), results visualization. Two examples of flows solutions are presented: the interaction of a high-speed flow with a droplet and the second concerns the attenuation of a propagating shock wave.

Near-surface dynamics of a gas bubble collapsing above a crevice

“…It is implemented in ECOGEN (Schmidmayer, Petitpas & Daniel 2019 a ; Schmidmayer et al. 2019 b ), which has been validated for several gas bubble dynamics problems, including free-space (Schmidmayer, Bryngelson & Colonius 2020) and wall-attached (Pishchalnikov et al. 2019) bubble collapses, and other multi-component problems such as liquid–gas shock tubes (Schmidmayer 2017; Schmidmayer et al.…”

High-speed video microscopy and numerical modeling of bubble dynamics near a surface of urinary stone

“…For modeling, we solved the multicomponent Euler equations using a two-dimensional (2 D)-axisymmetric code with adaptive time step and mesh refinement algorithms for fine resolution of the gas-liquid interface and shock fronts. 8,9 The use of a 2 D code instead of a one-dimensional (1D) spherical model [10][11][12][13][14][15][16] was motivated by the present and previous observations showing that oscillations of microbubbles can be highly nonspherical. 2,[17][18][19][20][21][22][23][24][25] Hsiao and Chahine 26 modeled a shelled microbubble subjected to one cycle of 2.5-MHz ultrasound at 1 MPa.…”

MFC: An open-source high-order multi-component, multi-phase, and multi-scale compressible flow solver

“…The radius R of our simulations is computed from the gas volume by assuming the shape is nearly spherical; this closely matches the solution expected following the Keller-Miksis equation [72]. We assess and compare the quality of our simulation with ECOGEN [54] via computation of the bubble sphericity during the collapse-rebound process. Figure 4 (b) shows this sphericity ψ of the bubble, which is defined following Wadell [90] and a value of 1 indicates a spherical bubble.…”

“…MFC is, of course, not the only viable option for simulation of compressible multi-phase flows. For example, ECOGEN [54] offers a pressure-disequilibrium-based interface-capturing scheme that is well suited for the same problems reached by MFC. However, ECOGEN is built upon an intrinsically low-order MUSCL scheme that can inhibit both efficient simulation and physically fidelity when compared to the WENO schemes we use here, especially when augmented with our high-order cell-average approximations.…”