Abstract
To investigate higher harmonics induced by a submerged obstacle in the presence of uniform current, a 2D fully nonlinear numerical wave flume (NWF) is developed by use of a time-domain higher-order boundary element method (HOBEM) based on potential flow theory. A four-point method is developed to decompose higher bound and free harmonic waves propagating upstream and downstream around the obstacle. The model predictions are in good agreement with the experimental data for free harmonics induced by a submerged horizontal cylinder in the absence of currents. This serves as a benchmark to reveal the current effects on higher harmonic waves. The peak value of non-dimensional second free harmonic amplitude is shifted upstream for the opposing current relative to that for zero current with the variation of current-free incident wave amplitude, and it is vice versa for the following current. The second-order analysis shows a resonant behavior which is related to the ratio of the cylinder diameter to the second bound mode wavelength over the cylinder. The second-order resonant position slightly downshifted for the opposing current and upshifted for the following current.
Similar content being viewed by others
References
Baddour, R. E. and Song, S. W., 1990a. On the interaction between waves and currents, Ocean Eng., 17(1): 1–21.
Baddour, R. E. and Song, S. W., 1990b. Interaction of higher-order water waves with uniform currents, Ocean Eng., 17(6): 551–568.
Beji, S. and Battjes, J. A., 1993. Experimental investigation of wave propagation over a bar, Coast. Eng., 19(1): 151–162.
Bretherton, F. P. and Garrett, G. J. R., 1968. Wavetrains in inhomogeneous moving media, Proc. Roy. Soc. Lond., Ser. A, 302(1471): 529–554.
Brebbia, C. A. and Walker, S., 1980. Boundary Element Technique in Engineering, Newnes-Butterworths, 384.
Brossard, J. and Chagdali, M., 2001. Experimental investigation of the harmonic generation by waves over a submerged plate, Coast. Eng., 42(4): 277–290.
Brossard, J., Perret, G., Blonce, L. and Diedhiou, A., 2009. Higher harmonics induced by a submerged horizontal plate and a submerged rectangular step in a wave flume, Coast. Eng., 56(1): 11–22.
Chen, Q., Madsen, P. A. and Basco, D. R., 1999. Current effects on nonlinear interactions of shallow-water waves, J. Waterw. Port Coast. Ocean Eng., ASCE, 125(4): 176–186.
Friis, A., Grue, J. and Palm, E., 1991. Application of Fourier Transform to the Second Order 2D Wave Diffraction Problem, In M. P. Tulin’s Festschrift: Mathematicul Approaches in Hydrodynamics, SIAM, Philadelphia, USA, 209–227.
Grue, J., 1992. Nonlinear water waves at a submerged obstacle or bottom topography, J. Fluid Mech., 244, 455–476.
Isaacson, M. and Cheung, K. F., 1993. Time-domain solution for wave-current interactions with a two-dimensional body, Appl. Ocean Res., 15(1): 39–52.
Koo, W. and Kim, M. H., 2007. Current effects on nonlinear wave-body interactions by a 2D fully nonlinear numerical wave tank, J. Waterw. Port Coast. Ocean Eng., ASCE, 133(2): 136–146.
Lin, C. Y. and Huang, C. J., 2004. Decomposition of incident and reflected higher harmonic waves using four wave gauges, Coast. Eng., 51(5–6): 395–406.
Liu, C. R., Huang, Z. H. and Keat Tan, S., 2009. Nonlinear scattering of non-breaking waves by a submerged horizontal plate: Experiments and simulations, Ocean Eng., 36(17–18): 1332–1345.
Massel, S. R., 1983. Harmonic generation by waves propagating over a submerged step, Coast. Eng., 7(4): 357–380.
Ning, D. Z. and Teng, B., 2007. Numerical simulation of fully nonlinear irregular wave tank in three dimension, Int. J. Numer. Methods Fluids, 53(12): 1847–1862.
Ning, D. Z., Zhuo, X. L., Chen, L. F. and Teng, B., 2012. Nonlinear numerical investigation on higher harmonics at lee side of a submerged bar, Abstract and Applied Analysis, doi:10.1155/2012/214897.
Peng, Z., Zou, Q. P., Reeve, D. E. and Wang, B., 2009. Parameterisation and transformation of wave asymmetries over a low crested breakwater, Coast. Eng., 56(11–12): 1123–1132.
Ren, X. G., Wang, K. H. and Jin, K. R., 1997. A Boussinesq model for simulating wave and current interaction, Ocean Eng., 24(4): 335–350.
Ryu, S., Kim, M. H. and Lynett, P. J., 2003. Fully nonlinear wave-current interactions and kinematics by a BEM-based numerical wave tank, Comput. Mech., 32(4–6): 336–346.
Thomas, G. P., 1981. Wave-current interactions: an experimental and numerical study. Part 1. Linear waves, J. Fluid Mech., 110, 457–474.
Yoon, S. B. and Liu, P. L. F., 1989. Interactions of currents and weakly nonlinear water waves in shallow water, J. Fluid Mech., 205, 397–419.
Zaman, M. H. and Togashi, H., 1996. Experimental study on interaction among waves, currents and bottom topography, Proceedings of the Civil Engineering in the Ocean, JSCE, 12, 49–54.
Zaman, M. H., Togashi, H. and Baddour, R. E., 2008. Deformation of monochromatic water wave trains propagating over a submerged obstacle in the presence of uniform currents, Ocean Eng., 35(8–9): 823–833.
Author information
Authors and Affiliations
Corresponding author
Additional information
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51179028, 51222902, and 51221961), the National Basic Research Program of China (973 Program, Grant No. 2011CB013703), the Program for New Century Excellent Talents in University (Grant No. NCET-13-0076), and the Fundamental Research Funds for the Central Universities (Grant No. DUT13YQ104).
Rights and permissions
About this article
Cite this article
Ning, Dz., Lin, Hx., Teng, B. et al. Higher harmonics induced by waves propagating over a submerged obstacle in the presence of uniform current. China Ocean Eng 28, 725–738 (2014). https://doi.org/10.1007/s13344-014-0057-9
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s13344-014-0057-9