Simulation Outline Narcisse Ngada DESY, MKK 1) What is simulation ? 14.05.2014 2) Why simulation ? 3) Principles of simulation 4) Types of simulation � Analog simulation � Numerical simulation 5) Conclusion
1. What is simulation ? 2. Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 2 What is simulation?
1. What is simulation ? 2. Why simulation ? What is simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 3 Those who can, do. Those who can't, simulate. -- anonymous writer
1. What is simulation ? 2. Why simulation ? What is simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 4 � Simulation is an imitation of real-world activities � Simulation is a procedure to analyse physical systems � Simulation is performed by developing a model � A model builds a conceptual framing to describe a physical system
1. What is simulation ? 2. Why simulation ? What is simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 5 Physical system Experiments with the Experiments with models physical system of the physical system Mathematical Physical model model Analytical method Simulation (accurate) (approximate)
1. What is simulation ? 2. Why simulation ? What is simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 6 But please never forget! Physical system Simulation model Simulations are gross simplifications of the reality and are only as good as their underlying assumptions
1. What is simulation ? 2. Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 7 Why simulation?
1. What is simulation ? 2. Why simulation ? Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 8 � A study on the real system could be too dangerous, too complicated, too expensive � The real system doesn’t exist yet, isn’t understood or is very complex � The real system is working too fast / too slow or can’t be observed directly � Nowadays the complexity of physical systems in the power converters world makes the use of simulation unavoidable
1. What is simulation ? 2. Why simulation ? Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 9 Fields of application � Physics � Astrophysics � Chemistry � Biology � ecomomics � Power accelerators � Engineering Simulation � Power converters � Social science � Training � Education � Video games � And more…
1. What is simulation ? 2. Why simulation ? Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 10 Advantages of simulation � Saving time and money � Repeatable and optimizable � Studying the behavior of a system without building it � Helps to find un-expected behavior of the physical system
1. What is simulation ? 2. Why simulation ? Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 11 Disadvantages of simulation � Simulation errors � Can’t provide easy answers to complex problems � Can’t solve problems by itself � Time consuming and expensive
1. What is simulation ? 2. Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 12 Principle of simulation
1. What is simulation ? 2. Why simulation ? Principle of simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 13 Simulation � Input data (Modeling) � Boundary conditions � Solution of differential / integral equations (1) Analog simulation (2) Numerical simulation � Time precisely controllable � Space precisely controllable � Space less controllable � Time less controllable � Mainly for circuit simulation � Mainly for field simulation
1. What is simulation ? 2. Why simulation ? 3. Principle of simulation 4. Types of simulation 5. Conclusion 14 (1) Analog simulation (2) Numerical simulation time The current and voltage waveforms Surface current distribution of the coil and for a pure inductance circuit magnetic field strength along a vertical cut plane
1. What is simulation ? 2. Why simulation ? Principle of simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 15 (1) Analog simulation Modeling Kirchhoff's System of + + (Schematic) circuit laws DE / IE Current law Voltage law
1. What is simulation ? 2. Why simulation ? Principle of simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 16 (2) Numerical simulation Modeling Meshing and System of (Geometric) + + Boundary conditions DE / IE
1. What is simulation ? 2. Why simulation ? Types of simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 17 Analog simulation
1. What is simulation ? 2. Why simulation ? Analog simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 18 Some simulation tools � Pspice � Psim � Matlab / Simulink / SimPowerSystems / PLECS � LTSpice � CASPOC � ANSYS Simplorer
1. What is simulation ? 2. Why simulation ? Analog simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 19 Example(1): temperature simulation for European XFEL at DESY Tunnel design
1. What is simulation ? 2. Why simulation ? Analog simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 20 Example(1): temperature simulation for European XFEL at DESY � Motivation − Overview of temperature profile along the XTL-tunnel − Stable temperature profile (max. ∆ T of +/- 0.5 K) during operation modes � Goal − Analyze the transient thermal processes in the XTL tunnel � Input parameters − Heat sources / Heat sinks (dependent on a position) − Geology of the ground − Experience and temperature measurement in HERA
1. What is simulation ? 2. Why simulation ? Analog simulation 3. Principle of simulation 4. Types of simulation 5. Conclusion 21 Example(1): temperature simulation for European XFEL at DESY 2) Analyses with ANSYS CFD would 1) Analyses with Matlab were have cost too much computing limited to steady state calculation time & capacity
1. What is simulation ? 2. Why simulation ? Analog simulation: Simplorer 3. Principle of simulation 4. Types of simulation 5. Conclusion 22 Example(1): temperature simulation for European XFEL at DESY ANSYS Simplorer als simulation tool � Complex multiphysics circuit analysis: electrical, power electronic, electromagnetic, thermal, electromechanical and hydraulic � AC, DC and TR analysis � Based on numerical methods of mathematics � Non linear Multidomain-System simulation � Very stable simulation algorithm � Enough user licenses in our department
1. What is simulation ? 2. Why simulation ? Analog simulation: Simplorer 3. Principle of simulation 4. Types of simulation 5. Conclusion 23 Example1: temperature simulation for European XFEL at DESY � Duality principle � 50 m XTL tunnel section Groundwater Glacial till d 2 d 1 R i R s2 R s1 R B R L th C L th C s2 C s1 C B th
1. What is simulation ? 2. Why simulation ? Analog simulation: Simplorer 3. Principle of simulation 4. Types of simulation 5. Conclusion 24 Example(1): temperature simulation for European XFEL at DESY Start values - Ground water: 10 o C - Concrete: 10 o C - Inlet temperature: 23 o C ICA: T _Grundw asser := 283.15 T _Luft := 296.15 T _Beton:=273.15 T1>=1500u T2 > 16u T3>=1.8u T w r_10:=313.15 T w r_21:=293.15 T w r_22:=303.15 SET: Sw1:=1 SET: Sw1:=1 SET: Sw1:=1 SET: Sw1:=1 SET: Sw2:=0 SET: Sw2:=0 SET: Sw2:=0 SET: Sw2:=0 SET: Sw3:=0 SET: Sw3:=0 SET: Sw3:=0 SET: Sw3:=0 DEL: T1##7200 DEL: T2##3600 DEL: T3##7200
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