Cai, Xuan

Deutschmann, Olaf

Marschall, Holger

Wörner, Martin

English

KITopen

KIT – University of the State of Baden-Wuerttemberg andNational Research Center of the Helmholtz Association2. Phase Field Methods Cahn-Hilliard (CH) or Allen-Cahn (AC) equation for phase field advection C: phase field;1 for liquid and -1 for gas; it varies continuously over the diffuse interface CH or AC is coupled with momentum equ. through surface tension, linear momentum, viscous stress and buoyancy terms Development of Phase Field Methods with OpenFOAM®and its Application to Dynamic Wetting Processes Xuan Cai1, Holger Marschall2, Martin Wörner1 and Olaf Deutschmann11 Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Germany2 Center of Smart Interfaces, Technische Universität Darmstadt, Germany1. Motivation Wetting process in chemical reactor of foam structure Mathematical consistent modeling of moving contact lines on irregular solid surface→   Resolve stress singularity at no-slip wall  3. Development and Implementation Platform: OpenFOAM® (an open source CFD software package); interDyMFoam as starting point In Cahn-Hilliard, the mobility (4th order derivative) is for now treated in segregated manner with time-step sub-cycling In Allen-Cahn, Lagrange multiplier implemented to enforce phase volume conservation property  In momentum equation,  relative density flux term due to diffusion of components (central to volume conservation) Surface tension term is implemented as surface tension energy densityCtanh2exC    4. Validation (using Cahn-Hilliard) 2D Static mesh simulation 3D Adaptive Mesh Refinement (AMR) simulation interface region (refinement level = 2)InitialFinalSpreading on flat surface Spreading and sliding on 45° inclined surface5. Outlook Compensation scheme for wall energy relaxation model Block-coupled solution approach to phase field transport in Cahn-Hilliard equation Chemically and geometrically heterogeneous surface Pinning effect of droplet on inclined surface Representative complex sponge structure2 22( ) ( ( 1)( 1) )CC C C C Ct        u 22( ) ( 1)( 1)CC C C C Ct       uCH: AC: We acknowledge funding by Helmholtz Energy Alliance “Energy-efficient chemical multiphase processes”

Development of phase field methods with OpenFOAM and its application to dynamic wetting processes

https://publikationen.bibliothek.kit.edu/220096575/5841085

Development of phase field methods with OpenFOAM and its application to dynamic wetting processes

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