Carpetx-developers October 2021

carpetx-developers@lists.einsteintoolkit.org

2 participants
6 discussions

lapse terms in Whisky's fluxes
by Roland Haas 03 Nov '21

03 Nov '21

Hello Ian, While working on a hydro code for CarpetX the people involved (in cc via the mailing list) ran into the issue of how to handle the lapse the show up in the flux of the fluid equations. E.g. in GRHydro (nee Whisky) one uses a numerical flux of (say for D) in https://www.einsteintoolkit.org/thornguide/EinsteinEvolve/GRHydro/documenta… as F^i_D = D (\alpha v^i - \beta^i) yet the flux expressions used in the Riemann problem are computed as: \tilde F^i_D = D (v^i - \beta^i/\alpha) ie a factor of the lapse has been divided out. It gets put back when the fluxes are combined to compute a right hand side by using: RHS = \alpha_{i-1/2} F^j(x_{i-1/2}) - \alpha_{i+1/2} F^j(x_{i+1/2}) None of the CarpetX developers (with the possible exception of Erik, but his expertise is in a different area and in any case he does not remember) were involved in the original Whisky code. So: do you remember if there was a specific reason why the lapse was divided out in the expressions used in the Riemann problem? Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://pgp.mit.edu .

4 6

HydroToyGPU shocktube test plots
by Roland Haas 31 Oct '21

31 Oct '21

Hello all, For my poster presentation (poster is due Nov 1st) it would be great if I could include the shocktube test results for the hydro toy. If you could send this to me (along with the preferred way of spelling your names so that I can give proper credit) that would be great. Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.

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Weekly call at 10:00AM Eastern
by rhaas＠illinois.edu 26 Oct '21

26 Oct '21

Title: CarpetX developer call When: Weekly from 10am to 11am on Wednesday Eastern Time Join Zoom Meeting https://pitp.zoom.us/j/93861697232 Join by phone (CA) +1 647-558-0588 Join using SIP 93861697232(a)zoomcrc.com

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Weekly call at 10:00AM Eastern
by rhaas＠illinois.edu 20 Oct '21

20 Oct '21

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Weekly call at 10:00AM Eastern
by rhaas＠illinois.edu 12 Oct '21

12 Oct '21

1 0

Weekly call at 10:00AM Eastern
by rhaas＠illinois.edu 05 Oct '21

05 Oct '21

1 0

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Carpetx-developers October 2021