Alexander Evgenyevich Bondarev

Analysis of the development concepts and methods of visual data representation in computational physics

Main steps in the development of scientific visualization as a branch of science are discussed. The evolution and prospects of the development of concepts, methods, and approaches of visual representation of numerical results obtained in computational physics (mainly, in computational fluid dynamics) are discussed.

Multidimensional data analysis and visualization for time-dependent CFD problems

This paper is devoted to analysis and visualization of multidimensional data in problems of computational fluid dynamics (CFD). Multidimensional data are considered as the result of parametrical search and optimizing analysis. For such types of multidimensional data, analysis is aimed to find some hidden dependencies of specific parameters. This is the main difference of the proposed approach from the general approach of data analysis, which is usually applied to solve problems of classification and clusterization. A rough approximate approach is proposed for data processing. This approach includes data visualization in the space of principal components and data approximation by geometrical primitives (in particular, planes). An example of practical application of the proposed approach is given. The possibility of elastic maps application to multidimensional data in question is discussed.

A computational technology for constructing the optimal shape of a power plant blade assembly taking into account structural constraints

A computational technology for constructing the optimal shape of a power plant three-dimensional blade assembly is presented. The shape of the blade assembly is optimized to improve the power characteristics of the blade assembly taking into account structural constraints. The computational technology is a unified chain of algorithms beginning with constructing a CAD model of the assembly, generation of a computational grid, simulation of the flow around the assembly using OpenFoam, and finally the animated stereo visualization of the power plant operation. The visual representation of the results in all phases is required for debugging, verification, and control. The proposed technology provides a basis for finding the optimal shape of the blade assembly by varying its key geometric parameters. Practical results of the simulation are discussed.

Analysis of Space-Time Structures Appearance for Non-Stationary CFD Problems

Abstract The paper presents a combined approach to finding conditions for space-time structures appearance in non-stationary flows for CFD (computational fluid dynamics) problems. We consider different types of space-time structures, for instance, such as boundary layer separation, vortex zone appearance, appearance of oscillating regimes, transfer from Mach reflection to regular one for shock waves, etc. The approach combines numerical solutions of inverse problems and parametric studies. Parallel numerical solutions are implemented. This approach is intended for fast approximate estimation for dependence of unsteady flow structures on characteristic parameters (or determining parameters) in a certain class of problems. The numerical results are presented in a form of multidimensional data volumes. To find out hidden dependencies in the volumes some multidimensional data processing and visualizing methods should be applied. The approach is organized in a pipeline fashion. For certain classes of problems the approach allows obtaining the sought-for dependence in a quasi-analytical form. The proposed approach can be considered to provide some kind of generalized numerical experiment environment. Examples of its application to a series of practical problems are given. The approach can be applied to CFD problems with ambiguities.