Blar i NTNU Open på forfatter "Ahmad, Nadeem"
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3D Numerical modelling of pile scour with free surface profile under waves and current using the level set method in model REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter, 2016)Wave action stirs up sediments and keeps it in suspension while currents wash it away from the coastal zone. The combined action of the waves and current close to the sediment bed may worsen the situation by creating ... -
3D numerical modelling of scour around a jacket structure with dynamic free surface capturing
Ahmad, Nadeem; Kamath, Arun; Bihs, Hans (Peer reviewed; Journal article, 2020)This paper presents a numerical investigation of local scour with dynamic free surface capturing around a jacket structure. The hydrodynamics and resulting scour are calculated using the open-source CFD model REEF3D. The ... -
A numerical investigation of erosion around offshore pipelines
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter, 2017)In this paper, a numerical investigation is carried out to model sea bed erosion around offshore pipelines deployed at the shoreline. The open-source CFD model REEF3D is used for the numerical modeling. The model solves ... -
CFD Modeling of Arctic Coastal Erosion due to Breaking Waves
Ahmad, Nadeem; Bihs, Hans; Alagan Chella, Mayilvahanan; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2019)Computational fluid dynamics (CFD) modeling of breaking waves over a slope and the resulting erosion in the case of an Arctic coastline is presented in this study. The study is performed with the open-source numerical model ... -
CFD Modeling of Local Scour Around a Pair of Tandem Cylinders under Wave Conditions
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)Local scour in a marine environment can lead to the failure of offshore and coastal structures. This is also the case, when marine infrastructure is built in Arctic conditions. The knowledge and understanding of erosion ... -
High-Resolution CFD Modelling of Scour in the Marine Environment
Ahmad, Nadeem (Doctoral theses at NTNU;2018:371, Doctoral thesis, 2018)Marine structures are vulnerable to scour under extreme weather conditions. Wave interaction with the structures leads to sediment transport locally. This results in the formation of scour holes which can affect the ... -
Numerical modeling of breaking wave induced seawall scour
Ahmad, Nadeem (Journal article; Peer reviewed, 2019)cour is recognised as one of the major causes of seawall failure. This paper presents numerical modelling of seawall scour due to wave impact on a vertical seawall. The modelling of waves hydrodynamics is based on the ... -
Numerical Modelling of Arctic Coastal Erosion Due to Breaking Waves Impact Using REEF3D
Ahmad, Nadeem; Bihs, Hans; Alagan Chella, Mayilvahanan; Arntsen, Øivind Asgeir; Aggarwal, Ankit (Chapter, 2017)In the present study, numerical modelling breaking waves over a slope and the resulting erosion in the arctic region is presented. The study is performed with the open-source computational fluid dynamics (CFD) model REEF3D. ... -
Numerical modelling of pipeline scour under the combined action of waves and current with free-surface capturing
Ahmad, Nadeem (Journal article; Peer reviewed, 2019)Understanding the pipeline scour processes under the combined action of waves and current is essential for adequate scour protection measures. This paper presents the numerical modelling of pipeline scour under the ... -
Numerical Modelling of Scour Around an Offshore Jacket Structure Using REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Lecture Notes in Civil Engineering;LNCE, volume 22, Chapter, 2019)In the present paper, a numerical investigation of the scouring around offshore jacket structure is carried out. The open-source CFD model REEF3D is used for the numerical modelling. The model solves the Reynolds-averaged ... -
Numerical simulation of waves and local scour around vertical cylinders in a triangular arrangement using REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter, 2015)Coastal and offshore structures are generally supported by a group of cylinders. The stability of the structures can be threatened by sediment transport around the foundations. To explore this topic in detail, numerical ... -
Open-Source CFD in Marine Engineering
Bihs, Hans; Kamath, Arun; Alagan Chella, Mayilvahanan; Ahmad, Nadeem; Aggarwal, Ankit; Arntsen, Øivind Asgeir (Journal article, 2015)In the case of highly complex problems in the field of marine, coastal and ocean engineering involving the free surface, such as breaking wave kinematics or flow around slender structures, a detailed solution is required ... -
Three-dimensional CFD modeling of wave scour around side-by-side and triangular arrangement of piles with REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)Sediment transport and resulting local scour in marine and coastal environments can lead to the failure of structures. The knowledge and understanding of erosion and sediment transport mechanisms and the correct prediction ... -
Three-dimensional numerical modeling of local scour around a non-slender cylinder under varying wave conditions
Ahmad, Nadeem; Afzal, Mohammad Saud; Bihs, Hans; Arntsen, Øivind Asgeir (Chapter, 2015)The three-dimensional numerical model REEF3D is used to simulate the detailed flow field and sediment transport around a non-slender cylinder under regular waves. The location of the free surface is calculated with the ... -
Three-dimensional numerical modelling of wave-induced scour around piles in a side-by-side arrangement
Ahmad, Nadeem; Bihs, Hans; Myrhaug, Dag; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2018)The paper presents the numerical modelling of wave-induced scour around piles in a side-by-side arrangement using the open-source CFD model REEF3D. The model solves the Reynolds-Averaged Navier-Stokes equations to calculate ... -
Three-dimensional numerical modelling of wave-induced scour around piles in a side-by-side arrangement
Ahmad, Nadeem; Bihs, Hans; Myrhaug, Dag; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2018)