Research

Wave Excitation Forces on a Sphere : Description of an Idealized Testcase

In DCE Technical Reports, 2023

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Abstract

1 Introduction and Objective Physical wave basin tests with a focus on uncertainty estimation have been conducted on a fixed sphere subjected to wave loads at Aalborg University as part of the effort of the OES Wave Energy Converters Modelling Verification and Validation (formerly, OES Task 10) working group to increase credibility of numerical modelling of WECs. The present note defines an idealized testcase formulated to accurately represent the physical tests in a simple way. The testcase consists of a fixed, rigid sphere half submerged in water subjected to regular waves of three different levels of linearity. The objective of the present note is to allow for numerical tests of the idealized testcase. Explanations for the structure and upload of numerical test outputs to a common SharePoint is also included. This allows partners in the OES WEC group for further comparative studies between the models and the physical test data. If the reader is not familiar with the previous work on building benchmark datasets from fluid-structure-interaction tests on the sphere under OES Task 10 it is recommended to start out with the following: 1) Become familiar with the background and intention of the sphere studies of the OES working group. For the current study, a similar procedure as the decay tests completed as the first part of the Kramer Sphere Cases will be followed [1]. 2) Become familiar with the status and plans of the work, e.g., by reading the presentations from the OES Task 10 Webinar on 2022-11-17 [2] and 2023-01-26 [3].