Cctk hydro
Download
1 / 23

CCTK Hydro - PowerPoint PPT Presentation


  • 123 Views
  • Uploaded on

CCTK Hydro. Malcolm Tobias Washington University [email protected] CCTK Hydro: A Status Report. Contributors: Miguel Alcubierre Gabrielle Allen Bernd Bruegmann Teepanis Chachiyo Thomas Dramlitsch Ed Evans Toni Font Tom Goodale Philip Gressman Paul Lamping Joan Masso

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' CCTK Hydro' - tejana


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Cctk hydro

CCTK Hydro

Malcolm Tobias

Washington University

[email protected]


Cctk hydro a status report
CCTK Hydro: A Status Report

Contributors:

Miguel Alcubierre

Gabrielle Allen

Bernd Bruegmann

Teepanis Chachiyo

Thomas Dramlitsch

Ed Evans

Toni Font

Tom Goodale

Philip Gressman

Paul Lamping

Joan Masso

Mark Miller

Philippos Papadopoulos

Ed Seidel

Nikolaos Stergioulas

Wai-Mo Suen

Malcolm Tobias

Rob Young


Overview
Overview

  • Cactus 3

    • Computational Modules (thorns)

      • Initial data

      • MAHC hydro

      • Newtonian hydro

      • Boson stars

      • EOS tables

      • Analysis tools

    • Tests

    • Physics

  • Cactus 4 conversion


Initial data
Initial data

  • Single NS (TOV)

  • Rotating NS

  • Head-on colliding NS

  • Quasi-equil. Data (Meudon Data)

  • PN initial data

  • Test Data (FRW, shockwave)

  • IVP solver

    • Coupled Ham. & mom. Constraints!!!

    • No assumptions of conformal flatness!!!


Mahc hydro
MAHC hydro

  • HRSC methods

    • Roe, Marquina, fluxsplit, ENO, HLLE

  • coupled to various evolution systems

    • ADM, Conformal systems, Bona-Masso

  • well tested (gr-qc/9811015)


Newtonian hydro
Newtonian Hydro

  • HRSC methods

    • primarily Roe solver

  • tested on multiple systems

    • single NS

    • head-on NSs

    • orbiting NSs

  • multiple test indicators

    • angular momentum

    • mass

    • energy


Boson stars
Boson stars

  • Coupled to a variety of GR evolution systems

  • stable over a long time scale


Eos tables
EOS tables

  • 1D tables

    • tested for polytropic EOS

    • other EOS are in, but not yet tested

    • thermo. consistent interp.

  • 2D tables

    • still under development

    • still need incorporated into evolution eqs.


Analysis tools
Analysis tools

  • Apparent horizon finders

  • waveform extraction

  • Newman-Penrose quantities

  • constraint evaluators


Tests
Tests

  • gr-qc/9811015

    • still fighting referee

  • variety of initial data

    • shocktube

    • FRW

    • single static NS

    • boosted NS


Tests gr hydro coupling
Tests: GR-hydro coupling

  • 3 hydro methods tested: Roe, fluxsplit and Marquina

  • 3 GR evolution systems: ADM, BM-Einstein and BM Ricci

  • often different finite-difference schemes (leapfrog, icn, etc.)

  • TEST EVERY COMBINATION OF EACH!!!


Tests gr hydro coupling 2nd order time space
Tests: GR-hydro coupling(2nd order time & space)





Physics
Physics

  • Phys. Rev. D 58 103002 (1998), gr-qc/9904041, gr-qc/9909059, Shapiro conjecture head-on collision of NS

  • evolution of quasi-equilibrium NS data (just beginning)

  • more on the way ;-)

  • How to do physics with cactus


Physics head on collision
Physics: head-on collision

  • Shapiro conjecture: can thermal pressure (from shock heating) delay the collapse in the head-on collision of NS s? Conjecture holds regardless of mass.

  • Take 2 1.4 solar mass NS (polytropic EOS, G=2, K=1.16x105 cm5/g/s2), give them a velocity corresponding to Newtonian infall from infinity, solve the IVP and see what happens!






Physics how to use cactus
Physics: How to use Cactus

  • Cactus is not a black box

    • many untested combinations of parameters

  • top down approach

    • check all equations/routines

    • test for consistency of all terms

    • test for convergence

  • bottom up approach

    • make sure results look "reasonable"

    • make sure results are "right"

    • test for convergence


Cactus 4 0
Cactus 4.0

  • Most hydro thorns still under conversion

  • What we will gain:

    • AMR infrastructure

    • better interfacing between GR-hydro solvers

    • more users=more developers & debuggers


ad