Evaluation of air compressibility effects on the performance of fixed OWC wave energy converters using CFD modelling

被引:101
|
作者
Simonetti, I. [1 ]
Cappietti, L. [1 ]
Elsafti, H. [2 ]
Oumeraci, H. [2 ]
机构
[1] Univ Florence, Dept Civil & Environm Engn, Florence, Italy
[2] TU Braunschweig, Leichtweiss Inst Wasserbau, Div Hydromech & Coastal Engn, Braunschweig, Germany
关键词
Wave energy converters; Oscillating Water Column; Air compressibility; Scale effects; Numerical study; Correction factors; OSCILLATING-WATER-COLUMN; SURFACE-PRESSURE; OPTIMIZATION; POWER; FLOW; VALIDATION; GENERATION; DYNAMICS; SYSTEMS;
D O I
10.1016/j.renene.2017.12.027
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study presents an evaluation of the error induced by neglecting the effect of air compressibility in modelling Oscillating Water Column (OWC) wave energy converters. A compressible two phases CFD model in the open-source software package OpenFOAM (R) is validated and then used to simulate a fixed OWC device, detached from the sea bottom. A comparative analysis of the results obtained by simulating the device at full-scale (1:1) and at four smaller scales (1:50, 1:25, 1:10 and 1:5) is performed in order to assess the scale effects associated with air compressibility. Indeed, for the air pressure levels considered in the simulations (up to 350 Pa at model scale 1:50), the effect of neglecting the air compressibility results in an overestimation up to about 15% for the air pressure in the OWC chamber and the subsequent air volume flux, but less than 10% for the capture width ratio. This overestimation increases with increasing pressure level. Results are analysed in terms of dimensionless parameters and a new parameter, strongly related to the compressible effects, is proposed and used to provide generalized equations delivering correction factors. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:741 / 753
页数:13
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