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Carl Birger Jenssen

Carl Birger Jenssen
CBJ Computing

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24
Publications
785
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163
Citations
Citations since 2016
0 Research Items
21 Citations
20162017201820192020202120220123456
20162017201820192020202120220123456
20162017201820192020202120220123456
20162017201820192020202120220123456

Publications

Publications (24)
Article
The vortex shedding in the wake behind linearly tapered circular cylinders has been considered for the two taper ratios 75:1 and 100:1. The Reynolds number based on the velocity of the incoming flow and the largest diameter was in the range from 130 to 180. The low Reynolds number assured that laminar flow prevailed in the entire flow field. The fu...
Article
A computerized flow analysis of wake phenomena caused by a discontinuity in cylinder diameter is presented. The vortex linkage and half-loop formation observed experimentally by Lewis and Gharib [Phys. Fluids A 4, 104 (1992)] have for the first time been reproduced numerically. The instantaneous vorticity and pressure fields provide a distinct pict...
Article
Computer simulations of the laminar flow past three-dimensional bluff bodies are presented. The focus is on the time-dependent wake flow behind linearly tapered circular cylinders and downstream of a circular cylinder with an abrupt change in diameter. In both cases the intricate vortex shedding phenomena observed in earlier laboratory experiments...
Chapter
A computational study of vortex shedding behind bluff bodies is presented. The main focus of this work is the study of vortex shedding and wake flow behaviour behind tapered circular cylinders in the laminar flow regime. However,a stepped circular cylinder in laminar flow as well as uniform circular cylinders in the turbulent flow regime have been...
Chapter
Large-eddy simulations of the turbulent flow past three-dimensional circular cylinders are presented. Results of simulations for two different uniform circular cylinders are shown and compared with experimental and DNS data. The LES convincingly reproduced the earlier laboratory and numerical observations. LES of flow past a tapered circular cylind...
Article
Full-text available
. An important field in computational science and engineering is the simulation of the coupled problem of fluid flow interacting with a moving structure. A common notation for this is fluid-structure interaction (FSI) problems, which include both aeroelasticity and hydroelasticity. Herein we give an overview of results obtained within FluidStructur...
Article
Full-text available
An important field in computational science and engineering is the simulation of the coupled problem of fluid flow interacting with a moving structure. A common notation for this is fluid-structure interaction (FSI) problems, which include both aeroelasticity and hydroelasticity. Such multi-physics systems have received renewed attention as a resul...
Article
Large Eddy Simulation (LES) has for a long time been considered a promising technique for predicting complex turbulent flows. Industrial use of LES is, however, still fairly limited due to the cost of predicting time dependent flow with the required mesh resolution. With the aid of parallel computers, this state of affairs is about to change, as co...
Article
Full-text available
. A parallel CFD code capable of simulating flow within moving boundaries is coupled to a beam element structural dynamics code. The coupled codes are used to simulate fluid-structure interaction for a class of applications involving long and slender structures, e.g., suspension bridges and offshore risers. Due to the difference in size and dimensi...
Conference Paper
A parallel CFD code capable of simulating flow within moving boundaries has been coupled to a beam element structural dynamics code. The coupled codes are used to simulate fluid- structure interaction for a class of applications involving long and slender structures, e.g. suspension bridges and offshore risers. Due to the difference in size and di...
Article
A parallel implicit Navier-Stokes solver is constructed using a block-by-block inversion of the resulting linear system of equations followed by a global coarse grid correction to account for the block coupling. This solver is used to compute two different cases of vortex shedding flows. The efficiency of our method is compared to the efficiency of...
Conference Paper
A parallel implicit Navier-Stokes solver is constructed using a block-by-block inversion of the resulting linear system of equations followed by a global coarse grid correction to account for the block coupling. This solver is used to compute two different cases of vortex shedding hows. The efficiency of our method is compared to the efficiency of...
Chapter
The time-dependent Navier-Stokes equations are solved on grids that are permitted to move or deform. An implicit time-integration scheme is used, resulting in a nonlinear system of equations solved by an approximate Newton procedure at each time step. A moving-grid algorithm is used, whereby the grid points are first moved and then a grid velocity...
Article
Implicit multiblock computations have been carried out for a large number of blocks using explicit coupling between the blocks. As the convergence rate of this method is very sensitive to the block partitioning, a block partitioning algorithm to subdivide a given multiblock mesh has been devised. Parallel computations of the flow over both a wing a...
Article
A coarse grid correction scheme is used to bring global influence to implicit multi block calculations. Compared to using only explicit coupling between the blocks, a considerable reduction in the number of time steps needed to reach steady state has been observed for subsonic flows. The additional CPU time per time step associated with the method...
Article
Structured multi-block grids are distinguished by regular quadrilateral cells (hexahedra in 3D) which allow to obtain solutions of good accuracy. However, this high degree of regularity is too stiff when considering geometrical complex shapes. The direct mapping of the physical domain onto one single computational domain becomes increasingly compli...
Article
Implicit multiblock computations have been carried out for a large number of blocks using explicit coupling between the blocks. The convergence rate of this method is very sensitive to the block partitioning. For the Navier-Stokes equations the height of the blocks should be greater than the boundary-layer thickness. Also, excessively thin blocks w...

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