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- Tetyana Vdovina, Susan E. Minkoff, Oksana Korostyshevskaya
- Multiscale Modeling & Simulation
- 2005

Modeling of wave propagation in a heterogeneous medium requires input data that varies on many different spatial and temporal scales. Operator-based upscaling allows us to capture the effect of the fine scales on a coarser domain without solving the full fine-scale problem. The method applied to the constant density, variable sound velocity acoustic wave… (More)

The numerical error associated with finite-difference simulation of wave propagation in discontinuous media consists of two components. The first component is a higher order error that leads to grid dispersion; it can be controlled by higher-order methods. The second component results from misalignment between numerical grids and material interfaces. We… (More)

In many earth science problems, the scales of interest range from centimeters to kilometers. Computer power and time limitations prevent inclusion of all the fine-scale features in most models. However, upscaling methods allow creation of physically realistic and computationally feasible models. Instead of solving the problem completely on the fine scale,… (More)

- William W. Symes, Igor S. Terentyev, Tetyana Vdovina
- 2009

Phase I of the SEAM Project will produce a variable-density acoustic synthetic survey over a 3D geological model simulating a deepwater subsalt exploration target. Due to the intended use of the data, the project places a premium on accuracy. Commercially produced Phase I synthetics will be spotchecked against benchmark simulations to assure quality. Thus… (More)

- Tetyana Vdovina, Susan E. Minkoff, Sean M. L. Griffith
- SIAM J. Scientific Computing
- 2009

Operator-based upscaling is a two-scale algorithm that speeds up the solution of the wave equation by producing a coarse grid solution which incorporates much of the local finescale solution information. We present the first implementation of operator upscaling for the elastic wave equation. By using the velocity-displacement formulation of the… (More)

- I M Kakhnovskiĭ, Alexey S Solomatin, Tetyana Vdovina
- Terapevticheskiĭ arkhiv
- 1995

- I M Kakhnovskiĭ, N V Antropova, Alexey S Solomatin, Zdeňka Marková, Tetyana Vdovina
- Klinicheskaia meditsina
- 1994

Hemodynamic parameters have been analyzed in 68 inpatients with large postoperative ventral hernia. Most of the patients showed normodynamic circulation. The artificial rise of the intra-abdominal pressure in the course of the preoperative preparation induced hypodynamic response of the cardiovascular system. Early after the surgery, the patients had… (More)

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