in Fusion Plasmas Research

Transcription

1 Effectiveness of Virtual Reality Technology in Fusion Plasmas Research H.Ohtani 1,2 A.Kageyama gy 3, Y.Tamura 4,, S.Ishiguro 1,2 N.Ohno 5, D.Matsuoka 5, R.Horiuchi 1,2 N.Mizuguchi 1,2, M.Shoji 1 1 NIFS, 2 Sokendai,, 3 Kobe University, 4 Konan University, 5 JAMSTEC 1

2 Outline Virtual Reality System CompleXcope of NIFS Why do we use VR system? Role in Simulation Science Application Analysis of Simulation Data Magnetic reconnection (Particle trace) Earth magnetosphere (Animation function) Simultaneous Visualization of Simulation and Experimental Device Data Simulation i results in LHD vessel Summary 2

3 Virtual Reality System CompleXcope of NIFS Room size 4 screens (Front, right, left bottom) Stereo view Immersive view Liquid crystal glasses Stereo view Tracking system Interactive view Stereo view on 4 screens by liquid crystal glasses Immersive view in the room composed of 4 screens Interactive view by tracking system and 3D mouse. Wand (3 dimensional mouse) Interactive view Viewer with liquid crystal glasses comes into the room, he is surrounded by 4 screens. He can see the stereo and immersive view through the liquid crystal glasses. When he moves his head or walks in the room, move the object by Wand, the images on the screens are reconstructed rapidly according to his movement by tracking system. Viewer feels himself being in the simulation model with high immersive feeling, and he can watch the objects with any size and from all direction. 3

4 Why do we use VR system? Simulation research Modeling Coding Calculating Analyzing Computertechnology technology : rapidly advanced. Simulation size : larger and larger. 3 dimensional/large scale simulation : commonly performed. >Simulation l results > more complicated. >Data size > massive. Analyzing is a key issue. Bringing out useful physical information from the massive simulation data. More effective analysis method.

5 Scientific Visualization by 2 D projected 3 D visualization by polygon (surface, streamline, contour and so on) > They helps us to understand the profiles of physical quantities of 3 D data. 3 D objects by polygon have to be projected on 2 D display. When the structure of objects by polygon is simple, > Easy reconstruction of 3 D structures in your brain. 5

6 Problem in Scientific Visualization by 2 D projected Particle trajectories, or magnetic field stream lines on the 2 D display by projection > Difficult to grasp the structures because of lack of the depth information. Stereo view presentation make it easy to grasp the 3 D structure. 6

7 Virtual Reality System CompleXcope of NIFS Room size 4 screens (Front, right, left bottom) Stereo view Immersive view 3 D structure of objects Liquid crystal glasses in the real 3 D space. Stereo view Tracking system Interactive view Stereo view on 4 screens by liquid crystal glasses Immersive view in the room composed of 4 screens Interactive view by tracking system and 3D mouse. Wand (3 dimensional mouse) Interactive view Viewer with liquid crystal glasses comes into the room, he is surrounded by 4 screens. He can see the stereo and immersive view through the liquid crystal glasses. When he moves his head or walks in the room, the images on the screens are reconstructed rapidly according to his movement by tracking system. Viewer feels himself being in the simulation model with high immersive feeling, and he can watch the objects with any size and from all direction. 7

8 Problem in Scientific Visualization by 2 D projected 3 D Simulation i Date should be Analyzed in 3 D Space!! Scientific Visualization by 3 D Virtual Reality System (CAVE System) Particle trajectories, or magnetic field stream lines on the 2 D display by projection > Difficult to grasp the structures because of lack of the depth information. 8

9 Analysis of Simulation Data

10 Basic software of visualization in VR space VFIVE General purpose VR visualization software Kageyama, Tamura, Sato (1999,2000) Ohno, Kageyama (2006,2007) You can download from Vector field Lines, arrows and so on. Scalar field Contour,isosurface, andvolume rendering. Improvement for tracing test particles in the electromagnetic field obtained by simulation. Ohtani, Horiuchi: PFR, 3, 054, (2008). Newton Lorentz equation in the electromagnetic field obtained by simulation Initial condition of test particle position: by wand, velocity by flow of simulation result

11 Application1: Magnetic reconnection VFIVE + Particle tracer Analysis of magnetic reconnection simulation data by particle Analysis of magnetic reconnection simulation data by particle simulation (PASMO). 11

12 VFIVE: Animation 1. After visualizing his data in CAVE interactively, user activates Animation i function. 2. VFIVE reads the next simulation data from HDD and visualizes them with the same parameters (ex., isosurface levels), and saves the polygonal data of the objects (ex., isosurface) as a macro of OpenGL called Display list (or to HDD when the number of time steps is large). T=1δT T=2δT T=nδT Reading data and visualization Activate! H.Ohtani et al: PFR 2010.

13 VFIVE: Animation 3. After saving the polygonal data of all time steps, VFIVE begins to display them in CAVE one after another T=1δT T=2δT T=nδT 3.

14 Application2: Earth magnetosphere Animation function MHD simulation data by Prof.Ogino of Nagoya University. 14

15 Simultaneous Visualization (Fusion) of Simulation and Experimental Device Data

16 Simultaneous Visualization (Fusion) of Simulation and Device Data vlhd(simulation data) Software for visualization of Large Helical Device (LHD) equilibrium plasma data by HINT code in VR space. Calculation and demonstration of isosurface of plasma pressure, stream line of magnetic field, and orbit of drift particle from arbitrary initial position and pitch angle. Virtools (Experiment device data) Software for visualization of objective description of LHD vessel of NIFS. Based on CAD data. Divertor,ICH antenna and so on are arranged at the same position of real LHD vessel.

17 FusionVR Master PC Fusion of several graphic data PC #1 PC #2 Capture of OpenGL graphic data Slave PC #1 3 Stereoview by Fusion VR Player Graphic h data by threedimensional visualization software based OpenGL is visualized in virtual reality space. Graphic G c data by multiple separate ate visualization software are captured, and then they are combined into one data in one VR space on a real time basis.

18 Application3: Simultaneous visualization in VR (vlhd+lhd).

19 Another application of VR system Field of vision from the observation port You can interactively see and check a plasma in vessel from the port before you set the observation tools. Work training in vessel VR system can construct full sized and three dimensional i vessel container and plasma. You can go through work training and grasp their three dimensional arrangement in VR space. It is useful and helpful for efficient work and prevention of accident. New experimental magnetic configuration VR system can present three dimensional i distribution ib i of strike points of new experimental magnetic configuration on diverter tile in vessel. You can understand how far the strike points depart from the diverter tile three dimensionally. Interference between the experimental equipment/between the equipment and plasma in vessel You can understand three dimensionally the distance between the equipment in the vessel, and the distance or the interference between the equipment and highenergy particle/peripheral plasma.

20 Summary Virtual reality technology is very useful to analyze the simulation data in the real three dimensional VR space. Magnetic reconnection by PIC simulation Earth magnetosphere by MHD simulation Simultaneous visualization of simulation and experimental device data is demonstrated. HINT simulation data and LHD vessel. 20

21 Future work Simulation data analysis Visualize data in VR space and find where interesting phenomena take place. And then perform a detail analysis by 2D analysis. We now build up a more closer connection between VR and 2D analysis. Simultaneous visualization By improvement of interface of input data, arbitrary simulation data can be visualized with experimental device data in VR space. 21