Physically-based interactive Schlieren flow visualization
Journal Article
·
OSTI ID:982208
- Los Alamos National Laboratory
- UNIV OF UTAH
Understanding fluid flow is a difficult problem and of increasing importance as computational fluid dynamics produces an abundance of simulation data. Experimental flow analysis has employed techniques such as shadowgraph and schlieren imaging for centuries which allow empirical observation of inhomogeneous flows. Shadowgraphs provide an intuitive way of looking at small changes in flow dynamics through caustic effects while schlieren cutoffs introduce an intensity gradation for observing large scale directional changes in the flow. The combination of these shading effects provides an informative global analysis of overall fluid flow. Computational solutions for these methods have proven too complex until recently due to the fundamental physical interaction of light refracting through the flow field. In this paper, we introduce a novel method to simulate the refraction of light to generate synthetic shadowgraphs and schlieren images of time-varying scalar fields derived from computational fluid dynamics (CFD) data. Our method computes physically accurate schlieren and shadowgraph images at interactive rates by utilizing a combination of GPGPU programming, acceleration methods, and data-dependent probabilistic schlieren cutoffs. Results comparing this method to previous schlieren approximations are presented.
- Research Organization:
- Los Alamos National Laboratory (LANL)
- Sponsoring Organization:
- DOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 982208
- Report Number(s):
- LA-UR-09-08318; LA-UR-09-8318
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ACCELERATION
APPROXIMATIONS
AUGMENTATION
COMPUTERIZED SIMULATION
DATA
DYNAMICS
FLOW VISUALIZATION
FLUID FLOW
FLUID MECHANICS
GLOBAL ANALYSIS
IMAGES
INTERACTIONS
PROGRAMMING
REFRACTION
SCALAR FIELDS
SHADING
SIMULATION
SOLUTIONS
VISIBLE RADIATION
GENERAL PHYSICS
ABUNDANCE
ACCELERATION
APPROXIMATIONS
AUGMENTATION
COMPUTERIZED SIMULATION
DATA
DYNAMICS
FLOW VISUALIZATION
FLUID FLOW
FLUID MECHANICS
GLOBAL ANALYSIS
IMAGES
INTERACTIONS
PROGRAMMING
REFRACTION
SCALAR FIELDS
SHADING
SIMULATION
SOLUTIONS
VISIBLE RADIATION