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FSI Project Spin off University of Rome Tor Vergata Modelling FSI problems in ANSYS Fluent via UDF.

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Presentation on theme: "FSI Project Spin off University of Rome Tor Vergata Modelling FSI problems in ANSYS Fluent via UDF."— Presentation transcript:

1 FSI Project Spin off University of Rome Tor Vergata Modelling FSI problems in ANSYS Fluent via UDF

2 FSI Project Spin off University of Rome Tor Vergata Fluid-Structure Interaction (FSI) there are heavy fluid actions on deforming boundaries it is not possible to neglect deformations phenomena are coupled and it is not possible to study the problem separating the structural and fluid effects A Fluid-Structure Interaction model is needed when: e.g. Hemodynamics FSI problem

3 FSI Project Spin off University of Rome Tor Vergata Benefits of FSI Simulation Investigate if problems are coupled Determine global performance difference comparing with the rigid case Analyze local flow field changes Analyze structural dynamic behaviour Structural verification Investigate if problems are physically stable/unstable and determine transition conditions

4 FSI Project Spin off University of Rome Tor Vergata The Proposed Product The Product aim is to allow FSI problems simulation entirely within ANSYS Fluent A dedicated FEM solver has been developed by means of UDF coding as plug in for ANSYS Fluent Dedicated Graphical User Interface (GUI) and Text User Interface have been developed The Product has been tested, validated and used to simulate practical and industrial cases

5 FSI Project Spin off University of Rome Tor Vergata Our Strategy Pressures, shear stresses and contact forces Displacements NO NO New: The product allows to set structure material properties and constraints in the ANSYS FLUENT code. CFD Mesh CFD Materials CFD BCs FEM Materials FEM BCs INITIALIZATION FEM Mesh is built from CFD one FEM Iteration Convergence? CFD Iterations More Time Steps? Remeshing/Smoothing Next Timestep New geometry POST-PROCESSING

6 FSI Project Spin off University of Rome Tor Vergata Product Features General robust FEM solver implemented Structural simulations in the range of small and large displacements, including non linear and contact problems 2D model for beams with implicit and explicit FEM approach 3D model for shells structure with implicit and explicit FEM approach Parallel implementation Static and dynamic transient analysis Multiphase and turbulence ANSYS Fluent model Post-processing with ANSYS Fluent

7 FSI Project Spin off University of Rome Tor Vergata The result is a very light code that leaves almost unaffected the global CPU time High efficiency Very light General purpose ANSYS Fluent users oriented There are no interpolation errors No other software knowledge is required Highly customizable for client-oriented solutions, services and consultancy. Product strengths

8 FSI Project Spin off University of Rome Tor Vergata Graphical User Interface Dedicated GUI in ANSYS Fluent

9 FSI Project Spin off University of Rome Tor Vergata The CFD point of view Very often FSI problems are analysed by a structural point of view simulating the fluid with too simplified models The present approach uses the CFD point of view (ANSYS Fluent users point of view), focusing on how the interaction with the structure influences the fluid behaviour The CFD user is now allowed to set structure material properties and constraints in order to easily simulate its presence in a very family way The knowledges of other software packages are not required

10 FSI Project Spin off University of Rome Tor Vergata Example of 3D model for shells structure (1) FSI Interaction between a rectangular curtain and an air flow in a room. This is an example in which because there are heavy fluid actions on the curtain surface and so it is necessary to consider its deformations WINDOW CURTAIN DOOR it is not possible to study the problem separating structural and fluid effects

11 FSI Project Spin off University of Rome Tor Vergata Example of 3D model for shells structure (2) Example of 3D model for shells structure (2) Hardware: 2 AMD Opteron 2,2GHz Processor 16Gb RAM Software: OS Linux Fedora 6 ANSYS Fluent Version Version: 3ddp Structural analysis solver used: Explicit HW & SW configuration

12 FSI Project Spin off University of Rome Tor Vergata Example of 3D model for shells structure (3) Case 1: The curtain has the top edge constrained. It’s moved by the air flow entering from the window and subjected to its dead load.

13 FSI Project Spin off University of Rome Tor Vergata Example of 3D model for shells structure (4) Case 2: In this case the event of failure of curtain support is investigated. The curtain is pushed by the air flow entering from the window and it’s free to fall because the top edge constraint is missing.

14 FSI Project Spin off University of Rome Tor Vergata Example of related areas In this branch of medicine is necessary to consider the interaction between the flowing blood and the vessels walls in order to investigate and study many hemodynamics problems. Hemodynamics and FSI Fluid-Structure Interaction Hardware: 2 AMD Opteron 2,2GHz Processor 16Gb RAM Software: OS Linux Fedora 6 ANSYS Fluent Version Version: 3ddp Structural analysis solver used: Implicit solver working with MSC.NASTRAN solver HW & SW configuration

15 FSI Project Spin off University of Rome Tor Vergata Example of hemodynamics problem (1) The following picture represents the model of a Systemic-to-pulmonary shunt that is a surgical procedure to treat complex congenital heart defects. It consists of an interposing tube between the sub-clavian artery and the right pulmonary artery. In this case it’s important to analyze the pressure drop across the shunt which is affected by the blood pressure combined with the distensibility of the shunt.

16 FSI Project Spin off University of Rome Tor Vergata Example of hemodynamics problem (2) SHUNT

17 FSI Project Spin off University of Rome Tor Vergata Contact University of Rome Tor Vergata Dept. Mechanical Engineering Via del Politecnico,1 – Rome, ITALY Tel: Dr. Marco E. Biancolini


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