Parallelized numerical modeling of the interaction of a solid object with immiscible incompressible two-phase fluid flow

Ghasemi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1108/EC-01-2016-0016
  3. Abstract:
  4. Purpose - A numerical method is developed to capture the interaction of solid object with two-phase flow with high density ratios. The current computational tool would be the first step of accurate modeling of wave energy converters in which the immense energy of the ocean can be extracted at low cost. Design/methodology/approach - The full two-dimensional Navier-Stokes equations are discretized on a regular structured grid, and the two-step projection method along with multi-processing (OpenMP) is used to efficiently solve the flow equations. The level set and the immersed boundary methods are used to capture the free surface of a fluid and a solid object, respectively. The full two-dimensional Navier-Stokes equations are solved on a regular structured grid to resolve the flow field. Level set and immersed boundary methods are used to capture the free surface of liquid and solid object, respectively. A proper contact angle between the solid object and the fluid is used to enhance the accuracy of the advection of the mass and momentum of the fluids in three-phase cells. Findings - The computational tool is verified based on numerical and experimental data with two scenarios: a cylinder falling into a rectangular domain due to gravity and a dam breaking in the presence of a fixed obstacle. In the former validation simulation, the accuracy of the immersed boundary method is verified. However, the accuracy of the level set method while the computational tool can model the high-density ratio is confirmed in the dam-breaking simulation. The results obtained from the current method are in good agreement with experimental data and other numerical studies. Practical/implications - The computational tool is capable of being parallelized to reduce the computational cost; therefore, an OpenMP is used to solve the flow equations. Its application is seen in the following: wind energy conversion, interaction of solid object such as wind turbine with water waves, etc. Originality/value - A high efficient CFD approach method is introduced to capture the interaction of solid object with a two-phase flow where they have high-density ratio. The current method has the ability to efficiently be parallelized. © Emerald Publishing Limited
  5. Keywords:
  6. CFD ; Free surface ; Immersed boundary ; Application programming interfaces (API) ; Computational fluid dynamics ; Computational methods ; Energy conversion ; Flow interactions ; Flow of fluids ; Navier Stokes equations ; Numerical methods ; Turbulent flow ; Viscous flow ; Water waves ; Wave energy conversion ; Wind power ; Wind turbines ; Design/methodology/approach ; Fluid solid interaction ; Free surfaces ; Immersed boundary ; Immersed boundary methods ; Level set ; Two-dimensional navier-stokes equations ; Two-step projection methods ; Two phase flow
  7. Source: Engineering Computations (Swansea, Wales) ; Volume 34, Issue 3 , 2017 , Pages 709-724 ; 02644401 (ISSN)
  8. URL: https://www.emeraldinsight.com/doi/abs/10.1108/EC-01-2016-0016