Hydrodynamic pressure computation under real sea surface on basis of autoregressive model of irregular waves
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Determining the impact of external excitations on a dynamic marine object such as ship hull in a seaway is the main goal of simulations. Now such simulations is most often based on approximate mathematical models that use results of the theory of small amplitude waves. The most complicated software for marine objects behavior simulation LAMP IV (Large amplitude motion program) uses numerical solution of traditional hydrodynamic problem without often used approximations but on the basis of theory of small amplitude waves. For efficiency reasons these simulations can be based on autoregressive model to generate real wave surface. Such a surface possesses all the hydrodynamic characteristics of sea waves, preserves dispersion relation and also shows superior performance compared to other wind wave models. Naturally, the known surface can be used to compute velocity field and in turn to determine pressures in any point under sea surface. The resulting computational algorithm can be used to determine pressures without use of theory of small-amplitude waves.
Keywordsautoregressive model wind waves hydrodynamic pressure virtual testbed
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- 1.A. Degtyarev and I. Gankevich, “Evaluation of hydrodynamic pressures for autoregression model of irregular waves,” in Proceedings of the 11th International Conference on Stability of Shops and Ocean Vehicles (2012), pp. 841–852.Google Scholar
- 2.V. A. Rozhkov and Yu. A. Trapeznikov, Stochastic Models of Oceanological Processes (Gidrometeoizdat, Leningrad, 1990) [in Russian].Google Scholar
- 3.A. Boukhanovsky, “Stochastic wind wave modeling considering its heterogeneity and non-stationarity,” Cand. Sci. Dissertation (Arctic Antarctic Res. Inst., 1997).Google Scholar
- 4.A. B. Degtyarev and A. M. Reed, “Modelling of incident waves near the ship’s hull (application of autoregressive approach in problems of simulation of rough seas),” in Proceedings of the 12th International Ship Stability Workshop, Washington, D.C. USA, June 12–15, 2011, Ed. by V. Belenky (DLA/DAPS, Annapolis, Maryland, 2011).Google Scholar
- 5.A. Degtyarev and A. Reed, “Synoptic and short-term modeling of ocean waves,” in Proceedings of the 29 the Symposium on Naval Hydrodynamics, Gothenburg, Sweden, August 26–31, 2012.Google Scholar
- 6.A. Degtyarev and I. Gankevich, “Wave surface generation using OpenCL, OpenMP and MPI,” in Proceedings of the 8th International Confernce on Computer Science and Information Technologies 2011, pp. 248–251.Google Scholar
- 7.N. E. Kochin, I. A. Kibel, and N. V. Roze, Theoretical Fluid Mechanics (Fizmatgiz, Moscow, 1963) [in Russian].Google Scholar