Article ; Online: General wetting energy boundary condition in a fully explicit nonideal fluids solver.
2023 Volume 108, Issue 5-2, Page(s) 55307
Abstract: We present an explicit finite-difference method to simulate the nonideal multiphase fluid flow. The local density and momentum transport are modeled by the Navier-Stokes equations and the pressure is computed by the van der Waals equation of the state. ... ...
| Abstract | We present an explicit finite-difference method to simulate the nonideal multiphase fluid flow. The local density and momentum transport are modeled by the Navier-Stokes equations and the pressure is computed by the van der Waals equation of the state. The static droplet and the dynamics of liquid-vapor separation simulations are performed as validations of this numerical scheme. In particular, to maintain the thermodynamic consistency, we propose a general wetting energy boundary condition at the contact line between fluids and the solid boundary. We conduct a series of comparisons between the current boundary condition and the constant contact angle boundary condition as well as the stress-balanced boundary condition. This boundary condition alleviates the instability induced by the constant contact angle boundary condition at θ≈0 and θ≈π. Using this boundary condition, the equilibrium contact angle is correctly recovered and the contact line dynamics are consistent with the simulation by applying a stress-balanced boundary condition. Nevertheless, unlike the stress-balanced boundary condition for which we need to further introduce the interface thickness parameter, the current boundary condition implicitly incorporates the interface thickness information into the wetting energy. |
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| Language | English |
| Publishing date | 2023-12-19 |
| Publishing country | United States |
| Document type | Journal Article |
| ZDB-ID | 2844562-4 |
| ISSN | 2470-0053 ; 2470-0045 |
| ISSN (online) | 2470-0053 |
| ISSN | 2470-0045 |
| DOI | 10.1103/PhysRevE.108.055307 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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