Computational Wave Hydromechanics in Support of Model Tests in The MASK Wave Basin
Abstract
Abstract State-of-the-art wavemaking and sensing capabilities in the newly unveiled MASK wave basin offer new opportunities and challenges going forwards as MASK develops into the premiere testing facility of its kind in the world. We propose a long-term research and development program in computational wave hydrodynamics to complement the scientific and technical capabilities and support the research and testing at NSWC Carderock. The capability we propose centers on the deterministic prediction of three-dimensional nonlinear wavefield in the MASK wave basin, taking into account of the basin geometry, wavemaking and sensing. This capability has heretofore never been fully achieved in this context in any large-scale tank but is expected to be the essential competence of all facilities of this class in the foreseeable future. The proposed research and development program has the following main objectives: I. Reconstruction and prediction. Provide deterministic phase-resolved three-dimensional whole-field data of the nonlinear wave kinematics and dynamics (wave elevation, velocity components, dynamic pressure, as well as Stokes-drift/current) in a (large) specified space and time domain (the ÒpredictedÓ zone), based on a limited set of wave measurements. The measurements can be hybrid (ultrasonic, wave staffs, etc.) covering different space and time locations/sub-domains. Obtain estimates of the accuracy and uncertainty of the waves within the predicted zone. II. Sensing design. Given a space and time domain of interest (the ÒtestÓ zone), design the necessary and optimal placement and deployment of sensing capabilities that maximizes the coverage and reliability/accuracy of the predicted wavefield. Inform the optimal space and time placement of the test zone constrained by available sensing assets, and the impact on the size and reliability of the predictable zone with incremental increase (or decrease) of sensing capability. III. Wavemaking modeling. Model the nonlinear wave-body interaction of the wave boards for any prescribed wave-maker motions to obtain phase-resolved prediction (with or without additional wave sensing) of the generated three-dimensional nonlinear evolving wavefield in the basin. Assess the ÒrealismÓ of the obtained wavefield in different test zones, compared to statistics and probability and physical characteristics of extreme events in the real ocean. IV. Wave board motion design and control. Given specifications of the desired ambient wavefield in terms of the statistical characteristics (including nonlinear effects such as Kurtosis) or phased-resolved features or episodic/extreme events in a test zone, design the phase and amplitude of the wave board motions to obtain and maximize the test zone. Design additional wave sensing to develop closed-loop feedback and control of the wave board motions. This research and development is expected to substantially advance the capability of the MASK basin as a world-class testing facility. By providing detailed full-field flow input, it will also close the loop between model tests and other advanced CFD tools to obtain direct phase-resolved comparisons.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 22, 2016
- Source ID
- N000141512460
Entities
People
- Dick K P Yue
Organizations
- Massachusetts Institute of Technology
- Office of Naval Research
- United States Navy