Simulation of filtration processes in deformable media

Abstract

A Lagrangian solver to realistically model large, non-spherical dirt particles and their behaviour in the vicinity of deformable filtration fibres has been programmed. While this paper focuses on basic solver concepts as well as drag force implementations, a related article, concerning the realisation of interaction effects and result verification, is forthcoming, [3].Within the framework of a digitally reconstructed, deformable filter fibre geometry, the solver traces the governing multi physics effects down to the occurrence of single force-and torque vectors. In order to go from an initial, spherical particle model [2], to a more sophisticated, non-spherical model, the capabilities of a Six Degrees of Freedom Solver have been included in the programming. A panel model and the concept of satellite help points are used to handle particles that encompass several fluid calculation cells.An innovative drag force implementation allows the consideration of rotational-and shear flow effects on particle motion. Results are evaluated and compared to an analytical formulation.

Multiphysics Simulation of Particle-Surface Interaction and its Effect on Powder Patterns and Process Optimization

“…The turbulence of the carrier airflow is modelled with the RAS k-ω shear stress transport model [22] using the SIMPLE algorithm [23]. The underlying solver also incorporates electrodynamic effects and forms the basis of the software coatSim [9]- [10], which has the capability to simulate pistols performing periodic translational and rotational motions directly on the cloud with the Massive Simultaneous Cloud Computing (MSCC) technology [11]. In the scope of this study the software has been utilized to set up the simulation case without any motion.…”

“…The fluid traction force, 𝐹𝐹 ⃗ 𝜕𝜕𝑟𝑟𝑡𝑡𝑐𝑐 , on the substrate surface can also be attained from the flow field as formulated in Equation (11). Here 𝝉𝝉 is the deviatoric part of the shear rate tensor.…”