Kenny Gruchalla

Kenny Gruchalla
National Renewable Energy Laboratory | NREL · Computational Science Center

Ph.D., Computer Science

About

47
Publications
7,892
Reads
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499
Citations
Additional affiliations
May 2011 - present
University of Colorado Boulder
Position
  • Research Assistant
June 2009 - present
National Renewable Energy Laboratory
Position
  • Senior Researcher
May 2006 - October 2008
National Center for Atmospheric Research
Position
  • Visitor

Publications

Publications (47)
Article
Full-text available
The National Renewable Energy Laboratory is actively developing and testing Immersive Industrialized Construction Environments (IICE) for construction automation and worker-machine interaction to investigate possible solutions and increase workforce productivity. At full scope and matured functionality, IICE allows us to accelerate the development...
Article
The increase in variable renewable generators (VRGs) in power systems has altered the dynamics from a historical experience. VRGs introduce new sources of power oscillations, and the stabilizing response provided by synchronous generators (SGs, e.g., natural gas, coal, etc.), which help avoid some power fluctuations, will lessen as VRGs replace SGs...
Article
Full-text available
This paper is associated with a video winner of a 2020 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2020.GFM.V0026.
Conference Paper
Full-text available
Understanding human perception is critical to the design of effective visualizations. The relative benefits of using 2D versus 3D techniques for data visualization is a complex decision space, with varying levels of uncertainty and disagreement in both the literature and in practice. This study aims to add easily reproducible, empirical evidence on...
Chapter
Book Series Editorial Board John Michopoulos, Naval Research Laboratory David Rosen, Georgia Institute of Technology Chris Paredis, Georgia Institute of Technology Judy Vance, Iowa State University This is the second volume in this book series that aims to capture advances in computers and information in engineering research, especially by research...
Conference Paper
Full-text available
We discuss the value of collaborative, immersive visualization for the exploration of scientific datasets and review techniques and tools that have been developed and deployed at the National Renewable Energy Laboratory (NREL). We believe that collaborative visualizations linking statistical interfaces and graphics on laptops and high-performance c...
Article
Full-text available
This paper presents the visualization approach for enhancing analyses of the ongoing Renewable Integration Impact (RIIA) Assessment by the Midcontinent Independent System Operator (MISO), and brings the following contributions. First, this paper details the customization of state-of-the-art, open-source visualization code to complement existing pow...
Chapter
In our daily usage of the large-scale immersive virtual environment at the National Renewable Energy Laboratory (NREL), we have observed how this VR system can be a useful tool to enhance scientific and engineering workflows. On multiple occasions, we have observed scientists and engineers discover features in their data using immersive environment...
Article
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Complex ensembles of energy simulation models have become significant components of renewable energy research in recent years. Often the significant computational cost, high‐dimensional structure, and other complexities hinder researchers from fully utilizing these data sources for knowledge building. Researchers at National Renewable Energy Labora...
Article
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In this paper, data from a lidar-based field campaign are used to examine the effect of yaw misalignment on the shape of a wind turbine wake. Prior investigation in wind tunnel research and high-fidelity computer simulation show that the shape assumes an increasingly curled shape as the wake propagates downstream, because of the presence of two cou...
Conference Paper
Full-text available
We describe a method for visualizing data flows on large networks. We transform data flow on fixed networks into a vector field, which can be directly visualized using scientific flow visualization techniques. We evaluated the method on power flowing through two transmission power networks: a small, regional, IEEE test system (RTS-96) and a large n...
Article
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In this paper, we investigate the role of flow structures generated in wind farm control through yaw misalignment. A pair of counter-rotating vortices is shown to be important in deforming the shape of the wake and in explaining the asymmetry of wake steering in oppositely signed yaw angles. We also demonstrate that vortices generated by an upstrea...
Article
Full-text available
In this paper, we investigate the role of flow structures generated in wind farm control through yaw misalignment. A pair of counter-rotating vortices are shown to be important in deforming the shape of the wake and in explaining the asymmetry of wake steering in oppositely signed yaw angles. We motivate the development of new physics for control-o...
Conference Paper
Full-text available
Data sizes are becoming a critical issue particularly for HPC applications. We have developed a user-driven lossy wavelet-based storage model to facilitate the analysis and visualization of large-scale wind turbine array simulations. The model stores data as heterogeneous blocks of wavelet coefficients, providing high-fidelity access to user-define...
Conference Paper
Full-text available
We have developed a framework for the exploration, design, and planning of energy systems that combines interactive visualization with machine-learning based approximations of simulations through a general purpose dataflow API. Our system provides a visual interface allowing users to explore an ensemble of energy simulations representing a subset o...
Article
Power use in data centers and high-performance computing (HPC) facilities has grown in tandem with increases in the size and number of these facilities. Substantial innovation is needed to enable meaningful reduction in energy footprints in leadership-class HPC systems. In this paper, we focus on characterizing and investigating application-level p...
Conference Paper
Full-text available
Lithium-ion batteries are currently the state-of-the-art power sources for electric vehicles, and their safety behavior when subjected to abuse, such as a mechanical impact, is of critical concern. A coupled mechanical-electrical-thermal model for simulating the behavior of a lithium-ion battery under a mechanical crush has been developed. We prese...
Article
Supported metal catalysts are commonly used for the hydrogenation and deoxygenation of biomass-derived aromatic compounds in catalytic fast pyrolysis. To date, the substrate-adsorbate interactions under reaction conditions crucial to these processes remain poorly understood, yet understanding this is critical to constructing detailed mechanistic mo...
Conference Paper
Full-text available
The Eastern Renewable Generation Integration Study (ERGIS), explores the operational impacts of the widespread adoption of wind and solar photovoltaic (PV) resources in the U.S. Eastern Interconnection and Québec Interconnection (collectively, EI). In order to understand some of the economic and reliability challenges of managing hundreds of gigawa...
Conference Paper
Full-text available
Assessing the impact of energy efficiency technologies at a district or city scale is of great interest to local governments, real estate developers, utility companies, and policymakers. This paper describes a flexible framework that can be used to create and run district and city scale building energy simulations. The framework is built around the...
Conference Paper
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We present a visualization-driven simulation system that tightly couples systems dynamics simulations with an immersive virtual environment to allow analysts to rapidly develop and test hypotheses in a high-dimensional parameter space. To accomplish this, we generalize the two-dimensional parallel-coordinates statistical graphic as an immersive " p...
Article
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Background: Substrate accessibility to catalysts has been a dominant theme in theories of biomass deconstruction. However, current methods of quantifying accessibility do not elucidate mechanisms for increased accessibility due to changes in microstructure following pretreatment. Results: We introduce methods for characterization of surface acce...
Article
The volume of data and the velocity with which it is being generated by com- putational experiments on high performance computing (HPC) systems is quickly outpacing our ability to effectively store this information in its full fidelity. There- fore, it is critically important to identify and study compression methodologies that retain as much infor...
Article
The coupled heat transfer and chemical kinetics processes inside of a pyrolyzing biomass particle are simulated with realistic intra-particle geometry to investigate the effects of the cellular structure on char yields. Although the technology exists for deriving liquid fuels from biomass via pyrolysis oil, it is not currently cost-effective relati...
Conference Paper
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We introduce an iterative feature-based transfer function design that extracts and systematically incorporates multivariate feature-local statistics into a texture-based volume rendering process. We argue that an interactive multivariate feature-local approach is advantageous when investigating ill-defined features, because it provides a physically...
Article
The High Performance Systems Biology Toolkit (HiPer SBTK) is a collection of simulation and optimization components for metabolic modeling and the means to assemble these components into large parallel processing hierarchies suiting a particular simulation and optimization need. The components come in a variety of different categories: model transl...
Article
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In this paper we discuss recent developments in the capabilities of VAPOR: a desktop application that leverages today's powerful CPUs and GPUs to enable visualization and analysis of terascale data sets using only a commodity PC or laptop. We review VAPOR's current capabilities, highlighting support for Adaptive Mesh Refinement (AMR) grids, and pre...
Conference Paper
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People in the locality of earthquakes are publishing anecdotal information about the shaking within seconds of their occurrences via social network technologies, such as Twitter. In contrast, depending on the size and location of the earthquake, scientific alerts can take between two to twenty minutes to publish. We describe TED (Twitter Earthquake...
Conference Paper
Full-text available
Knowledge extraction from data volumes of ever increasing size requires ever more flexible tools to facilitate interactive query. Interactivity enables real-time hypothesis testing and scientific discovery, but can generally not be achieved without some level of data reduction. The approach described in this paper combines multi-resolution access,...
Thesis
Full-text available
One of the barriers to visualization-enabled scientific discovery is the difficulty in clearly and quantitatively articulating the meaning of a visualization, particularly in the exploration of relationships between multiple variables in large-scale data sets. This issue becomes more complicated in the visualization of three-dimensional turbu- lenc...
Article
Five quantitative studies were conducted at TerraSpark Geosciences LP and at the BP Center for Visualization to determine the value gained by using large-scale three-dimensional (3D) visualization for directional well path planning. The first study focused on quantifying the intrinsic value of large-scale 3D visualization compared to desktop visual...
Conference Paper
Since the introduction of large-scale visualization systems in the energy industry over a decade ago, discussion has focused on the relative benefits, if any, of conducting typical exploration and development tasks in a large visualization environment vs. a desktop display. The only industry specific information with regard to benefits has been ane...
Conference Paper
Full-text available
Immersive virtual environments are becoming increasingly common, driving the need to develop new software or adapt existing software to these environments. We discuss some of the issues and limitations of porting an existing molecular graphics system, PyMOL, into an immersive virtual environment. Presenting macromolecules inside an interactive imme...
Conference Paper
Full-text available
The benefits of immersive visualization are primarily anecdotal; there have been few controlled user studies that have attempted to quantify the added value of immersion for problems requiring the manipulation of virtual objects. This research quantifies the added value of immersion for a real-world industrial problem: oil well-path planning. An ex...
Preprint
Full-text available
This paper proposes a new three-dimensional flow volume visualization primitive called a stream hull that is specifically designed for exploring the behavior of chaotic systems. A stream hull is a surface constructed by taking the convex hull of a small "cloud" of points. A chaotic dynamical system can be visualized using stream hulls by following...
Thesis
Full-text available
Immersive well path planning: The added value of interactive immersive visualization Thesis directed by Professor Clayton Lewis The benefits of immersive visualization are primarily anecdotal; there have been few controlled users studies that have attempted to quantify the added value of immersion for problems requiring the manipulation of virtual...
Article
In this paper, we describe an immersive prototype application, At-mosV, developed to interactively visualize the large multivariate at-mospheric dataset provided by the IEEE Visualization 2004 Contest committee. The visualization approach is a combination of volume and polygonal rendering. The immersive application was devel-oped and evaluated on b...
Article
Full-text available
The geometry of biomolecules dictates their function, but reasoning about that structure is difficult because of their 3D complexity and the range of scales involved. The wooden or plastic ball-and-stick models that are common in high-school chemistry labs help people rea- son about these issues when the molecules involved are small, but they are u...
Article
Full-text available
Thesis (M.S.)--University of Colorado, 2003. Includes bibliographical references (leaves 68-71).

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