Coupling Physics. Tomasz Stelmach Senior Application Engineer
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1 Coupling Physics Tomasz Stelmach Senior Application Engineer
2 Agenda Brief Multiphysics solution What is new in R18 Fluent Maxwell coupling wireless power transfer
3 Brief ANSYS Multiphysics
4 Flow Induced Motion Important in many industries Construction Avoid resonance Energy Oil & Gas: Structures exposed to fluctuating flow Power Plants: Vibrating Rods, damping Aerospace Aero-elasticity, flutter Automotive Reed valves, air filters Process Equipment Etc.
5 Comprehensive Multiphysics ANSYS offers flexible multiphysics simulations using Workbench Via advanced data exchange and streamlined solver interaction Built on deep, sophisticated solver technology Electromagnetics Structural- Mechanics Systems and Embedded Software Fluid Dynamics
6 Weak Strong Very Strong Multiphysics Workflows, Modeling Approaches Physical Coupling Biomedical, membranes, highly deformable solids, Vortex induced vibrations, Blade deformations, rigid bodies, CHT, small deformations (excluding turbulence induced), 1-way (uncoupled) Explicit 2-way Implicit Numerical Coupling Iterative Fully Coupled
7 Easy 1-Way Analysis Fluid Dynamics Fluid Dynamics OR OR Structural Mechanics Electromagnetics 1-way coupling is as easy as dragging and dropping in ANSYS Workbench Electromagnetics OR Structural Mechanics Volumetric Temperature Volumetric temperatures used for a thermal-stress analysis. Mapped Loss Electromagnetics Electromagnetic heat losses used for a thermal analysis. Temperature
8 FSI Workflows Other 1-way Load Transfers Transient 1-way Force can be passed from ANSYS CFD to Mechanical Time Domain: ACT extension available on customer portal A text format of transient CFD force can easily be mapped to the Mechanical model and used as transient load Frequency Domain A Fourier Transform of the transient CFD force can be used as load in a harmonic response analysis Transient Force Time or Frequency Domain Turbulent structures around a cone flow meter Deformation of the flow meter due to fluid forces
9 Robust, Stable 2-Way Multiphysics Integrate fluids and mechanical for stable coupled 2-way FSI simulations Force/Pressure FSI Thermal FSI Fluid Dynamics Structural Mechanics Fluids solution integrates additional options for stability Animation courtesy of Tetra Pak Two-way FSI package simulation to examine fluid sloshing effects on the structural integrity of a container.
10 Torque (N) Y1 [NewtonMeter] The Real World: More Than 2 Physics At Play Electromagnetics Fluid Dynamics Structural Mechanics Torque 2D_cooling_inside Curve Info avg Maxwell Moving1.Torque Setup1 : Transient Fluent Mechanical % drop in predicted performance Moving1.Torque_22_deg Imported Moving1.Torque_2eme_it_52deg Imported Moving1.Torque_3eme_it_53deg Imported Time [ms] Time (ms) Single physics simulation, assuming a magnet temperature of 22C 3-way Multiphysics simulation shows that the actual magnet temperature: 53C
11 What is new in ANSYS R18
12 System Coupling: Two-Way Thermal Coupling Extended support for System Coupling between Mechanical and CFX to include thermal coupling 17.1 HTC/Tref data transfer from CFX to Mechanical Twall data transfer from Mechanical to CFX 17.2 Wall heat flow data transfer from CFX to Mechanical Twall data transfer from Mechanical to CFX
13 RSM with System Coupling Project Update method sends the entire WB project to the remote machine then executes a Project Update Component submission to RSM (i.e. update only the System Coupling Solution cell) is not available Works for all supported queues/cluster Limited control over core assignments Limited solution monitoring available System Coupling log file is now updated on the client machine during an RSM job update Provides basic tracking of the job progress Monitor data and other log files only updated at the end of the run Can log in to the remote system, find the temporary files and manually track the Fluent, CFX, Mechanical and System Coupling log files
14 Fluent: Flow Controls added for Contact Detection Fluent has a Contact Detection feature to mark cells in small gaps and block the flow using a porous resistance Useful for valve opening/closing simulations and other contact scenarios R16: Not compatible with System Coupling. A UDF solution was developed for system coupling but it only worked when the contact zone was on a single partition. R17: Can mark cells in the contact zone for system coupling cases (β) but a UDF required to block the flow. R18: Released feature. No UDF needed. Cells marked for porous resistance No flow controls With flow controls
15 Fluent: Flow Controls added for Contact Detection
16 Fluent: Flow Controls added for Contact Detection
17 System Coupling: Thermal-Electric coupling (β) A Thermal-Electric system (which allows for the model of joule heating as well as Seebeck, Peltier, and Thomson effects for thermoelectricity) can be connected to System Coupling for co-simulation with CFX or Fluent Temperature Voltage
18 Other Enhancements Fluent: Smooth from Reference Position option to smooth relative to the initial mesh (when using diffusion or linear elastic solid smoothing). Fluid-Fluid or N-way Coupling System Coupling (α)
19 ANSYS Maxwell ANSYS Fluent Coupling Wireless Power Transfer
20 What is wireless power transfer? Wireless energy transfer or wireless power is the transmission of electrical energy from a power source to an electrical load without interconnecting wires Benefits for end users: Increased convenience (no electric wires) Universal charger (fits all portable devices) Lower energy consumption Prolonged battery life
21 What is ANSYS Maxwell? ANSYS Maxwell is the industry-leading electromagnetic field simulation software for the design and analysis of electric motors, actuators, sensors, transformers and other electromagnetic and electromechanical devices. Maxwell includes the following solvers: Magnetic Transient with rigid motion AC Electromagnetic Magnetostatic Electrostatic DC Conduction Electric Transient Expert Design Interfaces for electric machines and transformers ANSYS Simplorer Entry (circuit and system simulation)
22 ANSYS Fluent Setup Velocity Inlet: 5 m/s 5 W/m²K Convection Tunnel Sides = Symmetry Tunnel Wall = Adiabatic Walls Pressure Outlet: 0Pa
23 Workbench Project Workbench project
24 Enable Temperature Dependent Material and Feedback in Maxwell RMB on Copper and select Properties Check Thermal Modifier Temperature Dependent Bulk Conductivity
25 Enable Temperature Dependent Material and Feedback in Maxwell Go to Maxwell3D, Set Object Temperature Check Include Temperature Dependence and Enable Feedback
26 Enable Data Connection LMB Drag and Drop from Maxwell Solution Onto Fluent Setup
27 Update Maxwell Solution RMB on Maxwell Solution and select Update
28 Complete Maxwell Solution
29 Define Load Mapping in Fluent Double Click on Fluent Setup and Launch Fluent Select File, EM Mapping, Volumetric Energy Source
30 Define Load Mapping in Fluent Select coil1 and coil2 zones Click OK Mapping will be carried out and console window will confirm completion and loads
31 Solve Fluent Case Solve For 800 Iterations 800 Initialize Using Default Hybrid Initialization
32 Completed Fluent Case: Convergence Volume Averaged Temperature on coil1 & coil2
33 Competed Fluent Case: Temperatures
34 Competed Fluent Case: Velocity Vectors
35 Competed Fluent Case: Velocity Contours
36 Manual 2-Way Coupling Setup After Fluent Solution Completion RMB on Maxwell Solution: Select Enable Update
37 Manual 2-Way Coupling Update Update Project to Update Maxwell and Fluent Solution Repeat RMB Maxwell Solution, Enable Update, Update Project for each manual coupling iteration
38 2 Way Coupling Fluent Solution Convergence In the 2-Way case 200 iterations were used in the Fluent Calculate Panel Not 800 as with the one way case in the interest of time
39 2 Way Coupling Fluent Solution Convergence Volume Averaged Temperature on coil1 & coil2
40 2-Way Coupling with Feedback Iterator Connect Feedback Iterator component to Maxwell Setup Drag and drop Feedback Iterator from Component toolbar in Project Schematic Set Max Iterations = 3 Target Delta Temperature % = 0.01 to ensure all 3 iterations are completed Update Project
41 Completed 2-Way Coupling Case with Feedback Iterator
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