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Papers by Svetlana Poroseva

Research paper thumbnail of RANS Simulations of a Channel Flow with a New Velocity/Pressure-Gradient Model

22nd AIAA Computational Fluid Dynamics Conference, 2015

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Research paper thumbnail of Monte Carlo optimization of a matrix-based power-grid islanding algorithm

Spectral matrix methods are widely used for intelligent intentional islanding of power grids, the... more Spectral matrix methods are widely used for intelligent intentional islanding of power grids, the purposeful partitioning of a utility system to limit cascading disturbances. However, these methods may produce unbalanced islands of generators and loads when applied recursively. While some of the resulting islands have surplus generating capacity, others are deficient. We here implement a Monte Carlo simulated-annealing optimization procedure

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Research paper thumbnail of Network-theoretical approach to partitioning of real power grids

Modern societies depend critically on their electrical power grids. It is, therefore, essential t... more Modern societies depend critically on their electrical power grids. It is, therefore, essential to understand the grid's large-scale behavior in order to improve its resilience against catastrophic damage. A key factor determining the grid's large-scale behavior is its topology. In particular, an important question is whether a grid topology can be efficiently partitioned into independent communities (``islands'') of densely connected

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Research paper thumbnail of Optimization of a power-grid islanding algorithm using Monte Carlo simulations

The purposeful partitioning of a utility system to limit the cascading disturbances is called int... more The purposeful partitioning of a utility system to limit the cascading disturbances is called intelligent intentional islanding. Spectral matrix methods for intelligent intentional islanding of power grids may produce unbalanced clusters of generators and loads when applied recursively. While some of the resulting clusters have surplus generating capacity, others are deficient. To limit cascading power failures by isolating highly connected

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Research paper thumbnail of Designing survivable power systems

2008 IEEE/PES Transmission and Distribution Conference and Exposition, 2008

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Research paper thumbnail of Topology of the generator bus in a warship integrated power system

IEEE Electric Ship Technologies Symposium, 2005., 2005

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Research paper thumbnail of On Development of Computational Tools for Evaluating System Survivability Due to Its Topology

52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2011

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Research paper thumbnail of Structural analysis for assessment of monitoring possibilities: Application to simple power system topologies

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008

Abstract Any power system, either an integrated power system in an all-electric ship or a utility... more Abstract Any power system, either an integrated power system in an all-electric ship or a utility power system, needs to be highly reliable. Reliability of a complex system strongly depends on the possibility of detecting faults and isolating them from each other, ie, on the monitoring potential of the system. The area of power system engineering that is concerned with the fault detection and isolation is called protection. As power systems becoming more and more complex, current standards for their protection should be adjusted accordingly ...

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Research paper thumbnail of PANS simulations of the turbulent flow over a surface mounted cube

ABSTRACT

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Research paper thumbnail of Experimental study and mathematical simulation of the characteristics of a turbulent flow in a straight circular pipe rotating about its longitudinal axis

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Research paper thumbnail of Physics of pressure-strain correlation in rapidly distorted turbulence

Rapid distortion calculations of initially anisotropic turbulence are performed to better underst... more Rapid distortion calculations of initially anisotropic turbulence are performed to better understand the physics of pressure-strain correlation. In the talk several interesting aspects of the correlation behavior inferred from the simulations will be presented. Although these features of the correlation appear self-evident, most of the current models violate them. The violations are significant as they appear to directly lead to unrealizable and inconsistent model behavior.

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Research paper thumbnail of Application of evidence theory to quantify uncertainty in forecast of hurricane path

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Research paper thumbnail of Simulation of Separated Flows with the K-Epsilon Model

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Research paper thumbnail of Laminar solution in an oscillating channel flow and its implication to the turbulent case

ABSTRACT

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Research paper thumbnail of Simulation of a turbulent rotated pipe flow with the structure - based model

ABSTRACT

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Research paper thumbnail of Computation of turbulent flow in a rotating pipe using the structure-based model

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Research paper thumbnail of On Further Enhancement of CFD Predictive Algorithms Based on Evidence Theory

The Dempster-Shafer theory of evidence provides two basic tools -- i) belief functions that repre... more The Dempster-Shafer theory of evidence provides two basic tools -- i) belief functions that represent the degree of belief (confidence) in a given proposition on the basis of given evidence, and ii) Dempster's rule for combining the belief functions generated by different sources in relation to the same proposition. Previously, we have shown that these tools can be used effectively in application to various CFD problems (subsonic flow around the RAE 2822 airfoil and hurricane/typhoon track forecasts). The current study focuses on further enhancement of the predictive algorithms employing Dempster's rule. Specifically, we analyze one of the requirements of Dempster's rule that belief functions corresponding to different sources should be constructed using independent evidence. In CFD problems, evidence is experimental/observational data, which can be quite limited in number and barely sufficient to construct a single belief function. Application of Dempster's rule requires a minimum of two belief functions. We examine the origin of the requirement that independent data be used to construct belief functions and consider a strategy to overcome this constraint and its implications.

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Research paper thumbnail of Application of Evidence Theory to Quantify Uncertainty in Turbulent Flow Simulations

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Research paper thumbnail of Validation of a new k-epsilon model with the pressure diffusion effects in separated flows

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Research paper thumbnail of Uncertainty Quantification in Hurricane Path Forecasts using Evidence Theory

ABSTRACT

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Research paper thumbnail of RANS Simulations of a Channel Flow with a New Velocity/Pressure-Gradient Model

22nd AIAA Computational Fluid Dynamics Conference, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Monte Carlo optimization of a matrix-based power-grid islanding algorithm

Spectral matrix methods are widely used for intelligent intentional islanding of power grids, the... more Spectral matrix methods are widely used for intelligent intentional islanding of power grids, the purposeful partitioning of a utility system to limit cascading disturbances. However, these methods may produce unbalanced islands of generators and loads when applied recursively. While some of the resulting islands have surplus generating capacity, others are deficient. We here implement a Monte Carlo simulated-annealing optimization procedure

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Network-theoretical approach to partitioning of real power grids

Modern societies depend critically on their electrical power grids. It is, therefore, essential t... more Modern societies depend critically on their electrical power grids. It is, therefore, essential to understand the grid's large-scale behavior in order to improve its resilience against catastrophic damage. A key factor determining the grid's large-scale behavior is its topology. In particular, an important question is whether a grid topology can be efficiently partitioned into independent communities (``islands'') of densely connected

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of a power-grid islanding algorithm using Monte Carlo simulations

The purposeful partitioning of a utility system to limit the cascading disturbances is called int... more The purposeful partitioning of a utility system to limit the cascading disturbances is called intelligent intentional islanding. Spectral matrix methods for intelligent intentional islanding of power grids may produce unbalanced clusters of generators and loads when applied recursively. While some of the resulting clusters have surplus generating capacity, others are deficient. To limit cascading power failures by isolating highly connected

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Designing survivable power systems

2008 IEEE/PES Transmission and Distribution Conference and Exposition, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Topology of the generator bus in a warship integrated power system

IEEE Electric Ship Technologies Symposium, 2005., 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On Development of Computational Tools for Evaluating System Survivability Due to Its Topology

52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Structural analysis for assessment of monitoring possibilities: Application to simple power system topologies

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008

Abstract Any power system, either an integrated power system in an all-electric ship or a utility... more Abstract Any power system, either an integrated power system in an all-electric ship or a utility power system, needs to be highly reliable. Reliability of a complex system strongly depends on the possibility of detecting faults and isolating them from each other, ie, on the monitoring potential of the system. The area of power system engineering that is concerned with the fault detection and isolation is called protection. As power systems becoming more and more complex, current standards for their protection should be adjusted accordingly ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of PANS simulations of the turbulent flow over a surface mounted cube

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Experimental study and mathematical simulation of the characteristics of a turbulent flow in a straight circular pipe rotating about its longitudinal axis

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Physics of pressure-strain correlation in rapidly distorted turbulence

Rapid distortion calculations of initially anisotropic turbulence are performed to better underst... more Rapid distortion calculations of initially anisotropic turbulence are performed to better understand the physics of pressure-strain correlation. In the talk several interesting aspects of the correlation behavior inferred from the simulations will be presented. Although these features of the correlation appear self-evident, most of the current models violate them. The violations are significant as they appear to directly lead to unrealizable and inconsistent model behavior.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of evidence theory to quantify uncertainty in forecast of hurricane path

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Simulation of Separated Flows with the K-Epsilon Model

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Laminar solution in an oscillating channel flow and its implication to the turbulent case

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Simulation of a turbulent rotated pipe flow with the structure - based model

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Computation of turbulent flow in a rotating pipe using the structure-based model

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On Further Enhancement of CFD Predictive Algorithms Based on Evidence Theory

The Dempster-Shafer theory of evidence provides two basic tools -- i) belief functions that repre... more The Dempster-Shafer theory of evidence provides two basic tools -- i) belief functions that represent the degree of belief (confidence) in a given proposition on the basis of given evidence, and ii) Dempster's rule for combining the belief functions generated by different sources in relation to the same proposition. Previously, we have shown that these tools can be used effectively in application to various CFD problems (subsonic flow around the RAE 2822 airfoil and hurricane/typhoon track forecasts). The current study focuses on further enhancement of the predictive algorithms employing Dempster's rule. Specifically, we analyze one of the requirements of Dempster's rule that belief functions corresponding to different sources should be constructed using independent evidence. In CFD problems, evidence is experimental/observational data, which can be quite limited in number and barely sufficient to construct a single belief function. Application of Dempster's rule requires a minimum of two belief functions. We examine the origin of the requirement that independent data be used to construct belief functions and consider a strategy to overcome this constraint and its implications.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of Evidence Theory to Quantify Uncertainty in Turbulent Flow Simulations

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validation of a new k-epsilon model with the pressure diffusion effects in separated flows

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Uncertainty Quantification in Hurricane Path Forecasts using Evidence Theory

ABSTRACT

Bookmarks Related papers MentionsView impact