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Fluid Structure Interaction

Fluid Structure Interaction simulation modeling is at the core of what we do at our Singapore office in BroadTech Engineering.

Featured Fluid Structured Interaction Case Studies

Fluid Structure Interaction

Multiphase Flow Simulation Modeling (eg. FSI simulation) of Hydraulic Oil Tank Reservoir

The hydraulic oil tank has multiple inlets and outlets with defined mass flow rates and mass flow rate varies with respect to time for each opening. Because of this tank oil level fluctuates continuously. A level set method is used simulate this kind of flow. Variation in flow rate modeled by multiplier functions. Pressure fluctuation on tank walls was reported.
Flapper valve FSI. In oil coolers, there is a flapper valve placed at the bottom to bypass excess oil. The flapper valve is nothing but a simple plate which is always closed and deforms when oil pressure exceeds a certain limit. So structural part was modeled by Abaqus and fluid part by FlowVision/StarCCM+. Deformation of the plate under different pressure conditions was calculated by setting up bidirectional coupling analysis.

Soiling of Mercedes-Benz Cars

The objective of this project is to develop an advanced computational tool that could simulate a full vehicle under rainy conditions. We want to create an environment that could replace expensive wind-tunnel experiments. We develop both Eulerian and Lagrangian multiphase models to simulate rain condition and water flow over the full car. Detached eddy simulation is used to model the flow over the car along with VOF and fluid film models.
Current commercial and open source software such as StarCCM+ and OpenFOAM lack the necessary tools to perfect simulation these complex multiphase phenomenon. Our team has developed new models in this CFD software to simulate the physics relevant to us.

Numerical FSI Simulation of a Supersonic Missile

Simulation Objective: Numerical simulation of a Supersonic missile using HPC Architecture
Methodology: A supersonic tank barrel launched a missile which is in the conceptual design phase, is modeled and then meshed in ICEM-CFD, with unstructured grids, and then subjected to a Supersonic simulation in Ansys fluent, to ascertain the flow streamlining of the external surface of its missile, including all its protrusions. This solution was run using a 20 TF HPC Machine, with 140 cores, which was also a demonstration study, to compare the solution time with a conventional parallel core workstation.
Result: This study was carried out to check the flow streamlining in presence of external protrusions. At speeds of Mach -2, the wire channel and fasteners used for the Airframe structure showed slight separation of the flow from the missile body. This detachment of the flow is corrected by suitably changing the location of the wire channel and smoothing out the leading edge. Further design changes are warranted, which will be carried out in the upcoming Analysis.

Heat Transfer/FSI Simulation of Heat Duct

Investigation of heat transfer and friction characteristics of the asymmetrically heated duct, with an array of cylinders as passive turbulators. This work involves exploiting von-Karman effect to obtain heat transfer enhancement near a heated plate with an array of cylinders used as passive turbulators.
The forces developed due to periodic vortex shedding behind the cylinders will lead to vibration in the cylindrical structure (FSI) and this can be used to disturb the boundary layer close the heated wall. Thus causing heat transfer enhancement.

Coupled Fluid-Structure Interaction (FSI) Analysis on a Cylinder Exposed to Ocean Wave Loads

Performed both one-way and two-way coupling FSI analyses on a typical offshore cylindrical member subjected to wave-induced loads.
Modeled a large amplitude non-linear wave based on the fifth-order Stokes wave theory. Used Volume of fluid (VOF) technique to track the water free surface.
Quantified both the structural and fluid response (wave loading) differences between the one-way and two-way coupling methods. Noticed the absence fluid (water) damping in the one-way coupling method.

Fluid-Structure Interaction Simulation of Nozzle Flow Exhaust

Simulation Objective: Numerical simulation of a Nozzle flow exhaust (Hot gases) (3rd Generation ATGM)
Methodology: Convergent divergent nozzle of a Third generation ATGM in research phase(Detailed Design), is modeled along with its control volume and then meshed in pointwise with a structured grid, which is refined at shock locations. This grid is then checked for grid independence and then run in Ansys fluent including the properties of the hot gases exhaust.
Result: This study was carried out to check the nozzle design, and the results indicated an optimum expansion of the flow. Mach -1 was reached the throat and then suitably expanded to Mach-4 at the extremes of the outlet. The shocks were captured. Heat flux through the nozzle was recorded. Recirculation patterns in the flow were checked and the nozzle design was approved for the conceptual prototype.

Fluid-structure interaction (FSI) in the axial compressor rotor-stator cascade of a Military turbofan engine

Performed precision CAD modeling of the blade and the flow path were modeled for ANSYS Mechanical and CFX respectively. Structured grid generation for military Jet-engine compressor intake cascade.
A 2-way FSI simulation was set up with mesh deformation.
Experimental results at the Military test facility were used to validate the CFD results.
Computational analysis of momentum transfer in counter-current, two-phase flows.
A nuclear reactor facility requires a safety water pumping system which would inject water into the reactor in case of a leak or emergency. This counter-current scenario of air flowing in one direction and water flowing in the other was the purpose of this research project.
Generated bottom-up structured grids for a complex 1:1 model of the test facility.
Carried out two-phase flow simulations over the generated grid using the Volume of Fluid (VOF) method. Assisted the Post Doc lab-in-charge for PIV measurements and validated the results.

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Customers will be provided with fully customizable Fluid-structure interaction analysis reports which outline the Methodology, in-depth analysis, and recommendations. This insight allows our clients to optimize performance and make informed engineering decisions in a scientific, proven manner.
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