3-多物理场仿真与经典案例共享

August 12, 2013
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wk.baidu.com处不在的多物理场
“Science can amuse and fascinate us all, but it is engineering that changes the world.” ISAAC ASIMOV
Most accurate fluids and stress calculation since the baffle shape also changes with time, changing the area exposed to fluid flow and pressure.
单向耦合
Multiphase flow in a closed tank with deforming baffles.
流体仿真 OR 结构仿真
– 3rd party simulation tools – In-house simulation tools – Measured experimental results
电机定子 的热应力
Automated data mapping of temperatures for a mechanical thermal-stress analysis
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One-Way Coupling
Two-Way Coupling
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液罐晃动时的隔板受力
双向耦合 Fluids Pressure Mechanical Stress and Deformation
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物理场间的自动数据交换
ANSYS Workbench – 自动、精确的数据交换功能 • 物理场不同、最佳实践的网格通常也不同(流体、结构、电磁) • 实际的几何形状很复杂、人工数据交换不可能 • 大量的验证保证了高精度的数据交换 Structural Mesh Fluids Mesh
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新产品开发趋势:多物理场仿真越显重要
Increasing Power Density
Advanced Materials
Need an image
Miniaturization
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Now, let’s add a Structural
simulation with loads transferred with a preview of the result. Drag it from into your CFD.project
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与实验或其他计算结果的数据交换
• 可方便·迅速地共享用于耦合的数据 even if engineers are separated by expertise or organization structure • 可耦合的外部数据:
透平翼的 热应力
Automated data mapping of temperatures to a mechanical thermal-stress analysis of a turbine blade
1 操作方便的CAE 仿真平台WORKBENCH 2 物理场之间的自动数据交换和优化
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WORKBENCH和多物理场仿真设定
Select Static Structural There are multiple “drop targets”
We have physics-specific engineering groups that don’t work together.
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内容
• 多物理场仿真
• ANSYS的多物理场仿真方案 • 多物理场仿真案例
Fluids Analysis
Fluids Study Predicts Flow Forces on a Surface 10 – 100 循环迭代 Structures Study Actual Deformation Reduces Fluid Surface area Revises Pressure Area Resistance
Fluids Pressure Mechanical Stress 数据交换 Fluids Pressure Mechanical Stress
More accurate stress calculation since actual/modeled fluids pressure is used.
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简便的单向耦合
• 1-way coupling is as easy as dragging and dropping in ANSYS Workbench
热流动仿真
多物理场仿真与经典案例共享
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August 12, 2013
王晓 ANSYS 日本技术部总经理 ANSYS Confidential & Proprietary
内容
• 多物理场仿真
• ANSYS的多物理场仿真方案 • 多物理场仿真案例
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August 12, 2013
单一物理场仿真 流体或结构
More accurate stress calculation since fluids pressure changes with time.
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• Solution stabilization for System Coupling Motion in Fluent – Improves convergence for strongly coupled FSI cases Ramping of data transfers during a time step – Promotes stability of solution
Environmental Sustainability
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产品的优化设计及重要性
Over Design
Higher Material Costs Increased Time to Market Inflated Fuel Costs
Under Design
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多物理场仿真
1. 可考虑设计对象的多物理场的相互影响, 2. 可加深对产品性能的理解。
结构力学
电磁学
流体力学
系统仿真
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August 12, 2013
It’s too hard and complex.
We don’t really need it. Single physics is adequate.
Multiphysics isn’t accurate enough or practical for real engineering work.
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Structural Analysis
Flow
Initial Pressure Area
逐步实施的多物理场仿真
单一求解器 Single Solver Solutions Multiphysics within Single Solver Solutions
流动仿真
结构仿真
•
•
Coupled solver for Dynamic Mesh Zones in Fluent – Improves robustness for all mesh morphing applications
Animation courtesy of Tetra Pak Two-way FSI package simulation to examine fluid sloshing effects on the structural integrity of a container.
单一求解器
• Single solver solutions: Focus on a specific physics areas • Multiphysics within single solver solutions: Specialized models and elements provide additional physics
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Warranty Costs
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Product Failure
Legal Ramifications
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多物理场仿真的烦恼
We use other products and/or our own codes for the other physics.
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温度分布
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适用范围广、稳定性强的双向耦合
• 双向流·固耦合
– Force/Pressure FSI – Thermal FSI (R15)
• 高稳定性双向耦合的关键
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适用范围广、稳定性强的双向耦合
• 一个拖放就可实现的双向耦合 Couple electromagnetics with fluids and structures for thermal cooling and thermal stress analyses – High and low frequency
Data Mapping
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求解器耦合计算的优化
强耦合问题需要求解器间的高度协调性 • Geometry, set-up and solution procedures
多物理场仿真流程 Data Mapping
多物理场仿真流程
• Data mapping: Map data from experiments and other software packages for initial or boundary conditions • One-way couplings: Automatic results transfer for when one physics solution is dependent on another • Two-way couplings: Tight integration for when different physics solutions heavily impact each other
OR
结构仿真 电磁仿真
热流动仿真
电磁仿真
OR
OR
结构仿真
体积温度分布
Volumetric temperatures used for a thermal-stress analysis. 热损失数 据交换
电磁计算 Electromagnetic heat losses used for a thermal analysis.