Fluid Structure Interaction FSI

Fluid-Structure Interaction
Fluid-structure interaction (FSI) is the science of investigating fluid flows interacting with structures. And the occurred phenomena in the interaction. Moreover, Fluid-structure interaction (FSI) has a wide range of applications in many engineering systems. CFD Lab is highly specialized in Fluid Structure interaction. We use the FSI model just for cases that fluid and solid behavior are completely coupled and the reason for stress in a structure depends on the pressure distribution of fluid flow behavior. If pressure distribution around solid structural is uniform and by changing deflection is constant and is independent of fluid flow behavior, we do not suggest use the FSI model because the complexity and computational cost of FSI simulation are higher than fluid flow analysis or structural analysis. Even some times it is higher than the sum of total computational cost. So we suggest simulating the project by the FSI model just in non-uniform pressure distribution (based on fluid flow behavior) and in cases that by changing deflection pressure distribution will be changed.There are two methods for solving the FSI problem. One way and two way. In one way method, CFD solver software (ANSYS Fluent) steadily predict pressure distribution around solid structure and this pressure distribution will transfer to structural analysis software (ANSYS static structural) and based on this, stress distribution and in consequence final strain and deflection of structure will be predicted. This method is appropriate for analysis of fluid flow behavior around building and finding final deflection of building. However, in the two-way analysis FSI method, the simulation will be done in transient mode and in each time step pressure will transfer to structural software and deflection will transfer to CFD solver. This method will be used in various industrial and aerodynamic application such as wing fluttering and Coriolis flowmeter. Etc.We are highly experienced in the simulation of FSI problems and we use ANSYS Fluent package for solving this problem. ANSYS Fluent software is used for modeling fluid flow behavior beside, static structural and transient structural is used for modeling and simulating strain and stress analysis. In the following, there is a summary of our FSI project: simulation of stress and strain analysis of blood vessel in variable blood velocityPredicting final deflection and fluctuation of high altitude and skyscraper.Human heart stress analysis while pumping blood in a human vesselGenerating power from sea wave in beach using flexible structureStress and stress analysis of tidal turbine in submerged and submerged situationAirplane wing fluttering in turbulence fluid flowThe fluctuation of structure in vortex shedding region For instance, fluid-induced vibration (FIV) which is an FSI problem, is widely encountering in various applications. Such as pipes conveying fluids, cross-flow or parallel flow around solitary cylinders, vibrations related to pressure waves in piping, Surging in compressors, etc. The phenomena of interaction between fluids and structures may occur in internal and external flow through a complex process. This can happen by numerous factors such as the structure geometry, flow conditions, and fluid properties. Our CFD engineers at CFD Lab believe that in order to apply the possible advantages to industry and overcome existing disadvantages, it is necessary to scrutinize effective factors. Recent developments in the FSI field have provided mathematical and computational requirements for better understanding resulting in more effective CFD simulations. Eventually, the CFD simulations will lead to more efficient mechanical systems and help you improve the design of your systems.
CFD Lab is presenting here a CASE Study: Flutter Analysis of fighter aircraft wings Using High fidelity Coupled FSI Simulations. Flutter is an undesirable phenomenon encountered in flexible structures subjected to aerodynamic forces. This study focused on existing aircraft wings for flutter effects. The study was conducted using ANSYS software. Two ANSYS modules are used, transient structural for solving structure dynamics and deflections, and Fluent for aerodynamics of wing. The study required finding Flutter points and corresponding flutter Speed index for a specified wing. For this purpose the two modules are coupled with the help of third module called System Coupler. It helped in obtaining successive iterative scheme of computational fluid dynamics (CFD) and Compu￾tational Structural Dynamics (CSD).The study also required to compare MSc Nastran DLM based FSI capability with ANSYS coupled Simulations for Flutter boundary predictions.The coupled solver was successfully validated with AGARD 445.6 experimental flutter boundry and the results were in good agreement with refrence.
For FSI Modeling and Simulation, the specialized experts of CFD Lab will provide quality services. Share your queries with us at cfdlab.pk@gmail.com. Whatapp: +923105601600, www.cfdlab.pk
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