Abstract
The current paper discusses the physical impacts of the various initial boundary conditions of the free surface of a waterbody on the initiation and propagation characteristics of water waves due to the underwater perturbations. Differences between traditional point of view and applied numerical method in this paper for exertion the initial conditions of the generated waves by surface deformation were surveyed in the Lagrangian domain vs. Eulerian. In this article, the smoothed-particle hydrodynamics (SPH) technique was applied for simulating of wave generation process using initial boundary condition of water surface deformation through utilizing DualSPHysics numerical code and comparing the modeling results with recorded data. As a distinct approach, we studied the effects of discrete water particles on properties of produced surface waves by using the Lagrangian analytical capability of SPH model. Illustrative compatibility on simulation results with experimental data proves that meshless techniques such as applied in DualSPHysics software can reproduce physical properties of the event very well, and this is a suitable alternative to existing classical approaches for prediction of shock occurrences with nonlinear behavior such as generated surface water waves by underwater disturbance. Besides, the waveforms and their characteristics behave more realistic by considering the thrown upward water mass which was not directly considered in old formula and theories. The results of numerical modeling indicated rational agreement between numerical and empirical data proving that a complicated nonlinear phenomenon could be predicted by an SPH model which modified initial boundary conditions were supposed into the model with actual assumptions.
Highlights
Introduction and previous studiesExplosive behavior is the consequence of an internal chemical conversion which abandons massive amounts of heat and gas in a short term
The present study aimed to investigate the precision of smoothed-particle hydrodynamics (SPH)-type methods for measuring generated water waves by underwater disturbance occurrence; some new modeling tested cases were compared with proposed analytical solutions in the literature, experimental data as well as traditional numerical modeling results
In the rest of the time history of the water surface variations, such as the values of the maximum points and the correspondence of other points in time, there are not valuable modifications. In this part of study, the Mono Lake case is simulated by SPH method by using free surface deformation concept, so the capabilities of the SPH method and in particular the DualSPHysics code for simulation of collapse of initial cavity and generation of primary wave domain due to underwater explosion for different types of initial boundary conditions, are investigated
Summary
Explosive behavior is the consequence of an internal chemical conversion which abandons massive amounts of heat and gas in a short term. The present study aimed to investigate the precision of SPH-type methods for measuring generated water waves by underwater disturbance occurrence; some new modeling tested cases were compared with proposed analytical solutions in the literature, experimental data as well as traditional numerical modeling results. To simulate the surface waves generated by the underwater explosion, these perturbations are applied to the free surface of the water in the form of initial boundary conditions. Most types of free surface deformations were studied and applied for simulation and prediction of primary water wave generation due to the underwater explosion The initial conditions which are commonly used for predicting water waves generated by underwater explosions consist of one of the stationary surface deformations above according to considerable studies.
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