Hydrodynamics is the study of liquids in motion. In contrast to hydrostatics, hydrodynamics considers the response of a liquid to an imposed energy gradient. Numerical modeling is a powerful method of visualizing the dynamic behavior of physical systems. We have developed 1D, 2D and 3D models capable of accurately simulating water circulation in rivers, estuaries, coastal waters and continental shelf and deeper waters. All the models are founded solidity on the science of fluid mechanics/dynamics for circulation including such natural forces as tides, density stratification and buoyancy, wind stress, drag arising from shore line and bottom and Coriolis etc. We determining the mass flow rate of petroleum through pipelines, measuring flows around bridge pylons and off shore rigs, ship hull designing, optimizing propulsion efficiency, predicting weather patterns and wave dynamics and measuring liquid metal flows. Decreased fuel consumption, reduced drag on structures, minimizing noise and vibration and mitigating unwanted effects, like fouling.