Fluid-Structure Interaction Analysis Simulation
FSI Simulation is at the core of what we do here at our Singapore offices here at BroadTech Engineering.
Featured Case Studies
Vortex-Induced Vibration Analysis of Slender Truss Members
In order to assess the safety of an already built Flare Tower (160m high, FPSO mounted), on which vibration of members was suspected given certain wind conditions, it was decided that a series of analysis was to be performed, under different wind speeds and for different member shapes, as to determine the response surface and consequent safety of the building. Also, in case of necessity, it was requested that a simple, cheap appendix be designed to minimize the VIV effects observed.
To carry the task out, a diameter parametrized circular shape was created, along with rigid body properties (mass and inertias, as well as bar transversal stiffness) included implicitly in the parameter, and a fluid domain was constructed around it. After a few tests were carried out in 2D steady state, a suitable structured mesh was selected, including an appropriate inflation that would in no case exceed y+ < 10, and the transient fluid-rigid body model was carried out. Given its suitability for curved geometries, an SST turbulence model was selected (hence the y+ limitation) and parametric simulations were carried in parallel for a certain range of tubes. With the response surface fully determined, it was easy finding which tubes were actually problematic, and segregate those for later analysis.
After trying a few designs, a helicoidal appendix was selected as a suitable corrector, to be welded to the tubes. This induced extra turbulence, and significantly altered the flow pattern generated, effectively destroying periodic vortex generation, and consequently reduced transversal force variation and magnitude.
FSI Simulation of Fluid Flow over Water Filter
The objective was to determine the loss of pressure head across water filter of various designs and Reynolds number.
The filter operates by the principle of passing water over cylindrical channels. In the first design, the channels were perpendicular to the direction of flow. Our aim was to predict the angle of inclination of the channels, the diameter and speed of flow that gives the least head loss but still filters sentiments effectively.
For the purpose of this simulation, an in-house C++ code was written. Finite volume method was employed as well as immersed boundary method to mark out the walls of the channels.
We found that the head loss is highly dependent on the inclination of the channels as oppose to the speed of flow while the filtering effectiveness is sensitive to both the speed as well as the angle of inclination
In the water filter project, CFD analysis was critical to determine the pressure head loss across the filter because as we know, fluid is not driven by pressure, but it is driven by the pressure difference. Therefore a rigorous CFD analysis is necessary from dimensionless Reynolds number in and dimensionless pressure in which simulation is performed to actual pressure, the speed of flow and diameter of the channel that is applicable in the industry.
Sand Erosion Modelling in the Gas Pipeline Bends
For this FSI simulation analysis, specific types of CFD analysis that were applied includes CFD flow analysis, fluid dynamic analysis, multiphase flow simulation, and turbulent flow simulation. However, it would not be limited merely to these areas as it will also have things to do with thermal analysis. Since the pipeline case is related to the flow assurance which requires good isolation factor, the thermal condition within the pipe has to be kept under control.
Hence, thermal analysis is much needed for this kind of simulation. The areas such as CFD thermal analysis and steady-state thermal analysis can also be applied with. Moreover, it is also can be analyzed using FSI simulation as to show the impact of sand erosion on the pipeline structure.
FSI Simulation Analysis of Square Cylinder Beam and HIRENASD Wing
2D square cylinder beam is studied for conforming and non-conforming mesh cases. For CFD solver RANS is selected and LINEAR_ELASTIC method is used for CSD solver. The kinks appearing in interface regions are taken care by CONSIST_CONSERVE interpolation.
The beam displacement shows expected behavior under specific load and flow conditions.
FSI Simulation of Body Falling in a Fluid
Objective – A research project to identify how the vortex form behind the body interacts with the solid to change the course of its direction
Methodology – FreeFEM++, C++
Outcome: Two-fluid modes and three solid modes were identified. A theoretical model was designed to predict the unstable modes for heavy bodies
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