Fluid-Structure Interaction with Ansys CFD and Mechanical
Simulate interaction of structural mechanics and flow field
Learn to use 1-way and 2-way FSI to analyze piston motion, opening valves, or cooling by fluids. This training is offered as a 2-day course.
Duration
2 days
Prerequisites
Basic knowledge of Ansys Mechanical, Basic knowledge of Ansys Fluent or CFX
Software used
Ansys CFD, Ansys Mechanical
- 1-way load transfer of fluidic quantities to a structure (direct - external data)
- Export of quantities and loads from CFD post
- Heat transfer coefficients and ambient temperature in CFD and Mechanical
- System Coupling: setup, convergence aids, remeshing for 2-way transfer
Description
Fluid-structure interaction (FSI) describes how fluids and structures influence each other. In this process, a fluid can transfer a pressure load or a heat flow to the structure. The resulting deformation or motion may be large enough to, in turn, affect the flow space and thereby the flow. Typical applications include piston motion or opening and closing valves. In these cases, we are talking about 2-way FSI (system coupling analyses) and require detailed knowledge of both mechanical and CFD analysis and their coupling for simulation. In the training, you will learn convergence aids for both modules and their coupling as well as the fundamentals of remeshing the fluid space.
In many cases, however, a simpler 1-way coupling, where fluidic variables such as pressure or heat transfer coefficients are mapped to the structure, is sufficient. In other words, if the structure does not deform due to the flow load, it is often sufficient to work with the FSI concepts in Ansys CFD. This includes, in particular the SIX-DOF solver, which is available in both CFX and Fluent. We pay special attention to the calculation and evaluation of heat transfer coefficients to Ansys Mechanical. In the training, you will learn to distinguish between the different coupling variants, you will learn about typical areas of application, and you will also learn how to select and apply suitable methods for your tasks.
Detailed agenda for this 2-day training
Day 1
01 1-way coupling: direct load transfer from Ansys CFD to Mechanical
- Workbench link CFD-Mechanical for weak coupling
- Conservative and non-conservative quantities
- Interpolation between CFD and Mechanical meshes
- Quality control after mapping
- Demo: Pressure transfer to a flap with water flow around it
- Workshop IC cooling: Transfer of heat transfer coefficients (HTC)
02 1-way coupling: External Data for even more flexible load transfer
- External Data as general interpolation scheme
- Flexibility regarding geometries, meshes, coordinate systems, transferable quantities
- Export of CFD data
- Import into Mechanical
- Workshop IC-Cooling: Load Transfer to Fan Blades in Rotated Coordinate System
03 System Coupling I: Fundamentals of 2-Way Coupling
- 2-way coupling: when the return path becomes important
- Practical application areas
- Data Transfer and Control
- Demo Coupling: Transient CFD Analysis with Transient Thermal Analysis Workshop 2-way FSI: flap in a water flow
04 Special features of thermal load transfer
- 1-way coupling - transfer via Heat Transfer Coefficient (HTC)
- The right choice of HTC and reference temperature Tref
- 2-way coupling - Conjugate Heat Transfer (CHT)
- Coupling of steady-state flow and transient thermal analysis
- Demo/Workshop: IC cooling with different pairs (HTC, Tref)
Day 2
05 FSI concepts inside CFD
- Rigid Bodies in CFX or Fluent
- Immersed Solid in CFX: Applications and Restrictions
- Rigid Bodies and Six-DOF in CFX and Fluent: Applications and Restrictions
- Workshop: elastically suspended flow obstacle as flow measure
06 Large deformations and remeshing
- Dynamic Mesh Update Methods in Fluent
- Remeshing tet-prism meshes: what do the local face/region face criteria do?
- Smoothing of meshes
- Remeshing hexa-meshes: the layering method
- Demo/Workshop: elastically suspended flow obstacle as flow measure
07 System Coupling II: Deepening of methods and best practice
- The role of time steps
- Convergence aids in Mechanical and CFD
- Working with the Contact Offset in Mechanical
- Damping in Mechanical and Stabilization in Fluent
- Pre-tensioned FSI analyses
- Demo
08 Outlook: Further coupling options
- Alternative mapping strategies for 1-way load transfer of large models
- Extension of 2-way possibilities: System Coupling outside the Workbench
- It doesn't always have to be CFD: FSI concepts in Mechanical (Coupled Thermal-Fluid Pipe FLUID116, Acoustic FSI FLUID30)
- It doesn't always have to be Mechanical: Intrinsic FSI in Fluent
- 2-way couplings in Mechanical: Thermal-Electric and Thermal-Stress
Your Trainers
Dr. rer. nat. Sigrid Lang
Daniel Rahn
Placement in the CADFEM Learning Pathway
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