The 4th Granular Matter Series Webinar will take place next Tuesday, 24 November. The speaker is Ken Kamrin, the topic and abstract are:
To the Continuum and Beyond!
The ability to predict granular flows efficiently has been a major challenge for years. An accurate and robust continuum model would be ideal, as it could lead to fast simulation of industrial and geo-scale problems. However, there are a number of granular flow behaviors that complicate the development of a continuum treatment including coupled history effects, nontrivial phase change, pressure-sensitive yielding, nonlocal effects, and shear banding phenomena. Rather than attempt to combine all these effects together, this talk will begin by identifying a class of problems that tend to be well-predicted using a very simple continuum treatment. These are problems based on intrusion, where the intrusive dynamics of solid objects (e.g. locomotion, impact) is the primary interest. We then discuss two ways to extend this basic continuum framework with nonstandard “add-ons”, in order to handle various complications. First, we will discuss the state of affairs in nonlocal modeling approaches, and focus on some new results pertinent to the physics of nonlocality. Secondly, as an alternative to adding more complexity to the continuum model, we will discuss a hybridized DEM/continuum method that allows us to adaptively choose subdomains in a problem to be treated with continuum modeling vs discrete element modeling. This allows us to keep a simple and fast-to-solve continuum model almost everywhere, while providing a more precise DEM treatment in zones that fall outside the scope of the continuum model.
For more information, this is the landing page: https://www.springer.com/journal/10035/updates/18300828
And this is the link to the meeting room: https://global.gotomeeting.com/join/565338397
Abstract Granular and multiphase systems containing solid particles display a host of behaviors unlike those of their single-phase counterparts. The unexpected behaviors are often at odds with current hypotheses, which ultimately leads to a greater physical understanding. In this talk, results from our investigations into liquid-coated particles, clustering instabilities, and cohesive-particle flows will be presented. Each topic will be discussed in chronological order, revealing the unexpected results we encountered, the hypotheses we developed to explain said behaviors, and the testing of these hypotheses until a a physical understanding emerged that we were confident in. This presentation echoes considerably the material covered in the 2020 van ‘t Hoff lecture (September 2020, TU Delft Process Technology Institute), with modifications to target the Granular Matter webinar audience.