1 / 10

Progress on Forward Modeling for Acoustic Propagation Simulations

This report summarizes advancements in forward modeling techniques for acoustic propagation simulations. We focus on code development using Cartesian geometry and linear acoustic modes, achieving spectral accuracy in three dimensions. The implementation of 3D MHD and a third-order Runge-Kutta time-stepping method with Newton-Raphson iterations enhances our capabilities. Recent test cases include the propagation of acoustic wave packets and the study of density anomalies in three dimensions. Ongoing work explores sound-speed perturbations and subsurface magnetic fields.

stacey
Download Presentation

Progress on Forward Modeling for Acoustic Propagation Simulations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Progress on Forward Modeling for Acoustic-Propagation Simulations Joe Werne(1) Keith Julien(2) (1)NorthWest Research Associates, Inc. (NWRA) Colorado Research Associates Division (CoRA) 3380 Mitchell Lane, Boulder, CO 80301 werne@cora.nwra.com (2)Department of Applied Mathematics University of Colorado, Boulder, CO julien@colorado.edu Julien, Werne CU, CoRA/NWRA

  2. Progress on Forward Modeling for Acoustic-Propagation Simulations • Code Development: • Cartesian Geometry • Linear Acoustic Modes • 3D MHD • Spectral Accuracy in all 3 Directions • 3rd-order Runge-Kutta time stepping w/internal Newton-Raphson iteration scheme for implicit operations • Currently generalizing and adapting wave-radiation formalism for acoustic-wave radiation Julien, Werne CU, CoRA/NWRA

  3. Progress on Forward Modeling for Acoustic-Propagation Simulations • Test Cases: • Acoustic wave-packet propagation, inviscid evolution • 1-D with constant sound speed (test diffusion/dispersion) • 3-D density anomaly (coin in two orientations) Julien, Werne CU, CoRA/NWRA

  4. Progress on Forward Modeling for Acoustic-Propagation Simulations 1)1-D with constant sound speed (test numerical diffusion/dispersion): 0 dt 140 dt 280 dt After 2400 dt, amplitude drops by  0.7%. Negligible dispersion and diffusion errors. gridpoint gridpoint Julien, Werne CU, CoRA/NWRA

  5. 50 Mm 12.5 Mm C1=50 km/s Progress on Forward Modeling for Acoustic-Propagation Simulations 2)3-D density anomaly (coin in two orientations): C0=36 km/s Julien, Werne CU, CoRA/NWRA

  6. Progress on Forward Modeling for Acoustic-Propagation Simulations 2)3-D density anomaly (coin in two orientations): Julien, Werne CU, CoRA/NWRA

  7. l = 4Mm n = 5 mHz 22 Mm Progress on Forward Modeling for Acoustic-Propagation Simulations 2)3-D density anomaly (coin in two orientations): Julien, Werne CU, CoRA/NWRA

  8. Progress on Forward Modeling for Acoustic-Propagation Simulations 2)3-D density anomaly (coin in two orientations): Julien, Werne CU, CoRA/NWRA

  9. Progress on Forward Modeling for Acoustic-Propagation Simulations 2)3-D density anomaly (coin in two orientations): February 2004 Julien, Werne CU, CoRA/NWRA Julien, Werne CU, CoRA/NWRA

  10. Progress on Forward Modeling for Acoustic-Propagation Simulations • Continued Test Work: • Sound-speed perturbations • Subsurface flows • Subsurface magnetic fields Julien, Werne CU, CoRA/NWRA

More Related