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Unformatted text preview: 1 FLUID FLOW VISUALIZATION Frits H. Post, Theo van Walsum Delft University of Technology, The Netherlands * Published in: Focus on Scientific Visualization , H. Hagen, H. Müller, G.M. Nielson (eds.), Springer Verlag, Berlin, 1993, pp. 1-40 (ISBN 3-540-54940-4) Abstract This paper presents an overview of techniques for visualization of fluid flow data. As a starting point, a brief introduction to experimental flow visualization is given. The rest of the paper concentrates on computer graphics flow visualization. A pipeline model of the flow visualization process is used as a basis for presentation. Conceptually, this process centres around visualization mapping, or the translation of physical flow parameters to visual representations. Starting from a set of standard mappings partly based on equivalents from experimental visualization, a number of data preparation techniques is described, to prepare the flow data for visualization. Next, a number of perceptual effects and rendering techniques are described, and some problems in visual presentation are discussed. The paper ends with some concluding remarks and suggestions for future development. 1 Introduction For centuries, fluid flow researchers have been studying fluid flows in various ways, and today fluid flow is still an important field of research. The areas in which fluid flow plays a role are numerous. Gaseous flows are studied for the development of cars, aircraft and spacecrafts, and also for the design of machines such as turbines and combustion engines. Liquid flow research is necessary for naval applications, such as ship design, and is widely used in civil engineering projects such as harbour design and coastal protection. In chemistry, knowledge of fluid flow in reactor tanks is important; in medicine, the flow in blood vessels is studied. Numerous other examples could be mentioned. In all kinds of fluid flow research, visualization is an key issue. 1.1 Purposes and Problems of Flow Visualization Flow visualization probably exists as long as fluid flow research itself. Until recently, experimental flow visualization, as described in section 2, has been the main visualization aid in fluid flow research. Experimental flow visualization techniques are applied for several reasons: • to get an impression of fluid flow around a scale model of a real object, without any calculations; • as a source of inspiration for the development of new and better theories of fluid flow; • to verify a new theory or model. Though used extensively, these methods suffer from some problems. A fluid flow is often affected by the experimental technique, and not all fluid flow phenomena or relevant parameters can be visualized with experimental techniques. Also, the construction of small scale physical models, and experimental equipment such as wind tunnels are expensive, and experiments are time consuming....
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This note was uploaded on 03/31/2012 for the course CHEMICAL 111 taught by Professor Ammar during the Spring '12 term at NED Univ. of Engineering & Tech..
- Spring '12
- The Land