
Grzegorz KarchNVIDIA | Nvidia
Grzegorz Karch
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16
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Introduction
Publications
Publications (16)
In multiphase flows, the evolution of fluid-fluid interfaces is of interest in many applications. In addition to fluid dynamic forces governing the flow in the entire volume, surface tension determines droplet interfaces. Here, the analysis of interface kinematics can help in the investigation of interface deformation and the identification of pote...
Line integration of stream-, streak-, and pathlines is widely used and popular for visualizing single-phase flow. In multiphase flow, i.e., where the fluid consists, e.g., of a liquid and a gaseous phase, these techniques could also provide valuable insights into the internal flow of droplets and ligaments and thus into their dynamics. However, sin...
In simulations of salt dissolving in water, viscous fingers emerge. Comparing a number of simulation runs with different parameters allows domain scientists to gain insight into this dissolution process. Researchers have developed a tool that allows interactive visual analysis of ensembles of such simulations at different levels of detail in an ada...
Scalar features in fluid flow are traditionally visualized with glyphs or using direct 3D representation, and their topology changes over time are often conveyed with abstract graphs. Using these techniques, however, the spatio-temporal evolution of features undergoing topological changes is difficult to analyze. In this paper, we propose a novel a...
In single-phase flow visualization, research focuses on the analysis of vector field properties. In two-phase flow, in contrast, analysis of the phase components is typically of major interest. So far, visualization research of two-phase flow concentrated on proper interface reconstruction and the analysis thereof. In this paper, we present a novel...
We argue that there is a need for substantially more research on the use of generative data models in the validation and evaluation of visualization techniques. For example, user studies will require the display of representative and uncon-founded visual stimuli, while algorithms will need functional coverage and assessable benchmarks. However, dat...
Treating time as the third dimension of 2D time-dependent flow enables the application of a wide variety of visualization techniques for 3D stationary vector fields. In the resulting space-time representation, 3D streamlines represent 2D pathlines of the original field. In this paper, we investigate the application of different streamline-based vis...
The potential of web browsers as a platform for remote visualization has long been recognized. One of the motivations behind remote visualization has mainly been large data that cannot be easily transferred to the client. Further impeding factors for local visualization at the client side included lack of compute power or capabilities as well as la...
Concepts from vector field topology have been successfully applied to a wide range of phenomena so far—typically to problems involving the transport of a quantity, such as in flow fields, or to problems concerning the instantaneous structure, such as in the case of electric fields. However, transport of quantities in time-dependent flows has so far...
Piecewise linear interface calculation (PLIC) is one of the most widely employed reconstruction schemes for the simulation of multiphase flow. In this visualization paper we focus on the reconstruction from the simulation point of view, i.e., we present a framework for the analysis of this reconstruction scheme together with its implications on the...
Computational dye advection helps engineers understand fluid dynamics simulations by providing interactive tools that mimic physical experiments.
Advection has been the standard transport mechanism in flow visualization. Diffusion, in contrast, has not been considered important in visual flow field analysis so far, although it is inherent to many physical processes. We present a novel technique that allows for interactive 3D visualization of both advection and diffusion in unsteady fluid flo...
We introduce vortex catchment as a means for analyzing time-dependent vortex development and vortex dynamics in general. We utilize the Lagrangian frame, providing insight into the spatiotem-poral mechanisms that relate to a given vortex region. Thereby, our focus is on a gradual and continuous visualization, meeting the gradual properties of vorti...