Front Capturing

This paper is intended to describe recent progress on the development of the level-set method and IBM in the context of the advanced front-capturing and front-tracking methods. The paper is also intended to discuss the application of them for the 3-D DNS of two complex three-phase flow systems as described earlier. 

An alternative and complementary method is to follow the deformation of the material by following the boundaries of a fluid domain, by either the front capturing or front tracking technique. In the former, marker particles are distributed over the fluid domain volume and tracked over time, with the surface of the domain being restored by interpolation techniques in the latter, a separate moving mesh is used to describe the interface between the subdomain and the rest of the volume (86-89). 

The purpose of this section is to give an overview of the pertinent high resolution methods often referred in the literature on multiphase reactor modeling. These are The Maker and Cell (MAC) method [96], the Simplified MAC method [6], the volume of fluid (VOF) method[108], the level set (LS) front capturing method [214, 20, 186], and finally the front tracking method [227, 221[. 

It is noticed that after some re-evaluation Tryggvason and co-workers [228, 222] classified their front tracking method [227] as an embedded interface method, since it is best described as a hybrid between a front tracking and a front capturing method. 

Ferreira, J.A. Cimiinato, S. McKee, A front-trackiiig/front-capturing method for the simulation of 3D multi-fluid flows with Ifee surfaces. Journal cf Computational Physics, 2004, 198, 469-499. 

Volume of fluid (VOF) method Level set method Phase fleld method Diffuse interface model Interfacial flow Free surface flow Interface tracking Front tracking Front capturing... 

Kwakkel M, Breugem WP, Boersma BJ An efficient multiple marker front-capturing method for two-phase flow, Comput Fluids 63 47—56, 2012. 

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