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Introduction
Current institution
Publications
Publications (53)
An operational wave forecasting system forced with Global Forecast System (GFS) winds was presented and evaluated for the Arabian Sea. WAVEWATCH III (WWIII) model was used for wave forecasting. Several simulations were executed using different input-dissipation parameterizations embedded in WWIII including ST2, ST3, ST4 and ST6 packages for the per...
This study documents the atmospheric system driving the observed meteotsunami waves that hit the northern Persian Gulf on 19 March 2017 during high tide. This destructive meteotsunami event resulted in coastal inundations that reached several hundred metres inland along the 100-km coastline between the cities of Dayyer and Asaluyeh and caused the d...
In this study Geographic Information System (GIS) and System Dynamics (SD) were used for assessment of the impacts of storm surges on coastal communities. Storm Surges and coastal flooding were simulated using Advanced CIRCulation (ADCIRC) and Simulating Waves Nearshore (SWAN) numerical models, and spatial features of water depths, wave heights and...
A three-dimensional numerical simulation of regular waves passing over a monopile with square and circular cross-sectional shape was carried out to investigate flow field and vortex induced vibration. The rectangular wave flume and monopile are modeled with a solver; available in the open-source CFD toolkit OpenFOAM®. This solver applies the Reynol...
Three-dimensional RANS simulations are employed numerically to study flow characteristics around a near-wall circular cylinder for varying gap-to-diameter (G/D) ratios (Where G is the gap between the cylinder and the wall and D is the cylinder diameter) and at Reynolds numbers from 100 to 3900. Pressure distribution around the circular cylinder, ba...
Three-dimensional RANS simulations are employed numerically to study flow characteristics around a near-wall circular cylinder for varying gap-to-diameter (G/D) ratios (Where G is the gap between the cylinder and the wall and D is the cylinder diameter) and at Reynolds numbers from 100 to 3900. Pressure distribution around the circular cylinder, ba...
Three-dimensional numerical simulation of regular waves passing over
cylindrical monopile was conducted to investigate the hydrodynamic forces
and vortex dynamics. The rectangular wave flume and monopile were
modeled with a solver; available in the open-source CFD toolkit
OpenFOAM®. This solver applies the Reynolds-Averaged Navier-Stokes
(RANS...
Various spectral wave parameterizations are existed in WAVEWATCH III which can influence the simulated wave characteristics in a specified sea area. Previous researches showed that selecting appropriate spectral wave parameterization i.e. BAJ, WAM4, ACC350 and T&C depends on many factors including, sea characteristics and storm conditions which sho...
The third-generation wave model, WAVEWATCH III, was employed to simulate bulk wave parameters in the Persian Gulf using three different wind sources: ERA-Interim, CCMP, and GFS-Analysis. Different formulations for whitecapping term and the energy transfer from wind to wave were used, namely the Tolman and Chalikov (J Phys Oceanogr 26:497–518, 1996)...
Three-dimensional numerical simulation of regular waves passing over cylindrical monopile has been conducted to investigate the vortex dynamics. To do so the rectangular wave flume and monopile is modeled on a solver, available in the open-source CFD toolkit OpenFOAM®. The solver applied RANS equations with VOF method for tracking free surface. Mod...
The third generation wave model, WAVEWATCH III was employed to simulate bulk
wave parameters in the Persian Gulf using three different wind sources ERA-Interim,
CCMP and GFS-Analysis. Different formulations for whitecapping term and the energy
transfer from wind to wave were used including Tolman and Chalikov (1996), WAM
Cycle 4 (BJA and WAM4) and...
In this study, the performance of the third generation wave model, WAVEWATCH III, had been
evaluated for operational wave forecasting in the Persian Gulf. Three different embedded source term
packages in WAVEWATCH III for wave energy dissipation and energy transfer from wind to wave were
evaluated using GFS operational forecasted wind. Simulated wa...
The third generation wave model, WAVEWATCH III was employed to simulate bulk
wave parameters in the Persian Gulf using three different wind sources ERA-Interim,
CCMP and GFS-Analysis. Different formulations for whitecapping term and the energy
transfer from wind to wave were used including Tolman and Chalikov (1996), WAM
Cycle 4 (BJA and WAM4) and...
Flow around a circular cylinder near plane wall has been simulated using Open source CFD codes of OpenFOAM in different flow regimes (Re=100, 200, 3900) and different gap ratios (G/D= ∞, 1, 0.5, 0.2). Time-averaged pressure coefficients around a circular cylinder computed and compared with each others in different cases. Other features of flow incl...
Wind induced waves are one of the most important hydrodynamic parameters of water bodies and its forecasting is of great importance. Nowadays, numerical models are extensively used to hindcast or forecast the wave parameters. One of the well-known computational models for modelling and forecasting the sea waves is NOAA's WAVEWATCH III™ (WWIII) mode...
Flow around a circular cylinder near plane wall has been simulated using Open source CFD codes of OpenFOAM in different flow regimes (Re=100, 200, 3900) and different gap ratios (G/D= ∞, 1, 0.5, 0.2). Time-averaged pressure coefficients around a circular cylinder computed and compared with each others in different cases. Other features of flow incl...
One of the most vital tasks for coastal engineers is to calculate the gross longshore sediment transport rate (LSTR) to control the shoreline erosion and beach evolution. In the past decades, several empirical formulas or parametric models have been proposed for predicting the gross LSTR as a function of the breaking wave characteristics, bed mater...
Submarine pipelines, which often installed over seabed without any protection, are widely used to transport products from one location to another. In shallow water regions, the pipelines are affected severely by the wave-induced oscillatory motion. In this study a numerical model is presented to simulate the flow pattern around pipeline exposed to...
Submarine pipelines, which often installed over seabed without any protection, are widely used to transport products from one location to another. In shallow water regions, the pipelines are affected severely by the wave-induced oscillatory motion. In this study a numerical model is presented to simulate the flow pattern around pipeline exposed to...
An Eulerian two-phase flow model was presented and employed to investigate wave-induced tunnel scour beneath marine pipelines. The model is based on the Euler-Euler coupled governing equations for the fluid and sediment phases, i.e., time-averaged continuity and momentum equations were solved for both phases with a modified k - epsilon turbulence c...
Scour around pile groups is rather complicated and not yet fully understood due to the fact that it arises from the triple interaction of fluid-structure-seabed. In this study, two data mining approaches, i.e. Support Vector Machines (SVM) and Artificial Neural Networks (ANN), were applied to estimate the wave-induced scour depth around pile groups...
The scour around submarine pipelines may influence their stability; therefore scour prediction is a very important issue in submarine pipeline design. Several investigations have been conducted to develop a relationship between wave-induced scour depth under pipelines and the governing parameters. However, existing formulas do not always yield accu...
Forecasting of wave parameters is necessary for many marine and coastal operations. Different forecasting methodologies have been developed based on using the wind and wave characteristics. In this paper, Artificial Neural Network (ANN) as a robust data learning method is used to forecast the wave height for the next 3, 6, 12 and 24 hours at the Da...
Continuous scouring around submarine pipelines is of great importance because of its effects on the structural stability of pipelines. In this study, current-induced scour around submarine pipeline was numerically investigated. An Euler-Euler two-phase model was developed to simulate the early stages of scouring. The model solved time averaged cont...
In this study the force components and vortex shedding frequency of a pipe exposed to a steady current were numerically investigated in terms of the drag coefficient, lift coefficient and Strouhal number. The effects of the bed proximity and boundary layer thickness on these parameters were studied extensively. The Reynolds-averaged-Navier–Stokes e...
Scour around submarine pipelines remains a largely complex and not yet fully understood problem. In this study, wave-induced scour around submarine pipelines was investigated. Since various physical processes occur during the development of a scour hole, the effects of each process were considered by employing several nondimensional parameters. To...
A Etemad-Shahidi, MH Kazeminezhad, SJ Mousavi
Journal of Coastal Research, 505-509
Wind induced waves are the most important phenomenon to be considered in the coastal and offshore activities. Therefore, in this study the performance of three simplified methods for predicting the wave height in lakes are investigated. The data set used in this study comprises of wave data and over water wind data gained from Lake Ontario and Lake...
Hindcasting of wave parameters is necessary for many applications in coastal and offshore engineering and is generally made with the help of sophisticated numerical models. This paper presents alternative hindcast models based on Artificial Neural Networks (ANNs), Fuzzy Inference System (FIS) and Adaptive-Network-based Fuzzy Inference System (ANFIS...
Hindcasting of wave parameters is necessary for many applications in coastal and offshore engineering and is generally made with the help of sophisticated numerical models. This paper presents alternative hindcast models based on Artificial Neural Networks (ANNs), Fuzzy Inference System (FIS) and Adaptive-Network-based Fuzzy Inference System (ANFIS...
Offshore pipelines are exposed to hydrodynamic forces due to the current actions. The forces (drag and lift) have an unsteady nature and oscillate around their average values because of the occurrence of vortex shedding behind the pipeline. Vortex shedding leads to the Vortex-Induced-Vibration (VIV) which is an important source of fatigue damage of...
Laying offshore pipelines on the uneven sea floor makes the flow turbulence and instability behind the pipe, which is termed as the vortex shedding. Vortex shedding causes a periodic change in the net hydrodynamic pressure around the pipe which in turn increases significantly the potential of fatigue damage of a pipeline at the free span section. T...
For planning or designing maritime structures, wave observation with a long-term history is generally necessary. However, we may often encounter the problems that only short-term observed data were available or the records are incomplete in a station. In this study, the performances of a new generation spectral wind-wave model based on unstructured...
Wave prediction is one of the most important issues in coastal and ocean engineering studies. In this study, the performance of Adaptive-Network-Based Fuzzy Inference System (ANFIS) and Coastal Engineering Manual (CEM) methods for predicting wave parameters were investigated. The data set used in this study comprises of fetch-limited wave data and...
Questions
Question (1)
Hello everyone,
I would like to perform an analysis of associated extremes in metocean data (wind speed, wave height, and current speed) based on the DNV C205 code. I have experience in independent extreme value analysis for these parameters separately, but I now need to estimate associated extremes using a multivariate approach that is consistent with independent EVA.
Could anyone recommend a free package or software for performing multivariate extreme value analysis, preferably one that includes independent EVA as well? Additionally, I would appreciate any detailed methodology or guidance on how to conduct this analysis in accordance with the DNV C205 code.
Thank you in advance for your help!
