Verification and Validation of a Numerical Wave Tank Using Waves2FOAM

TL;DR

This paper presents a verification and validation study of a CFD wave tank model using Waves2FOAM, demonstrating its accuracy in simulating free surface flows by comparing with experimental data and theoretical solutions.

Contribution

It introduces a V&V approach for wave tank CFD modeling with OpenFOAM, combining code verification and experimental validation for improved reliability.

Findings

The CFD model accurately predicts free surface wave heights.

The VOF model shows good agreement with experimental data.

The approach enhances confidence in CFD tools for wave energy research.

Abstract

Clean energy systems have been investigated recently by the researchers of the University of New Mexico to increase the efficiency specifically in the solar tower technology. Similar to solar energy, wave power harnesses energy that comes from the sun. Solar irradiation causes wind by changing the pressure, and wind gives its momentum to the ocean surface which produces waves. Modeling and simulation (M&S) of free surface flow can be a very useful tool for the wave energy industry. However, if these tools are to be relied upon, their accuracy must be tested and shown to be sound. In this investigation, we focus on verification and validation (V&V) of wave tank flow M&S. The Volume of Fluid (VOF) model was applied to perform transient computational fluid dynamics (CFD) analysis using the numerical simulation software OpenFOAM. To assess V&V, the height of the free surface flow was considered as the system response quantity (SRQ). Stokes theory (fifth order) was utilized as the most accurate available approximation of the exact solution to measure the order of accuracy of the discretized mathematical model which is known as code verification. Data collected during model-scale testing at the Naval Surface Warfare Center, Carderock Division (NSWCCD) Maneuvering and Seakeeping (MASK) basin were utilized to validate the computational results. The CFD domain consists of a two-dimensional plane representing the region of interest of the wave basin which has several wave height measurement probes. Our simulation results were compared to the data from one of these probes in order to conduct the V&V analysis. Code verification and comparison with experimental values demonstrate the accuracy and efficiency of our model.