November 2021 - Carpetx-developers - lists.einsteintoolkit.org

Weekly call at 10:00AM Eastern
by rhaas＠illinois.edu 30 Nov '21

30 Nov '21

Title: CarpetX developer call When: Weekly from 10am to 11am Eastern Time on Wednesday 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 23 Nov '21

23 Nov '21

Title: CarpetX developer call When: Weekly from 10am to 11am Eastern Time on Wednesday 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 16 Nov '21

16 Nov '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 09 Nov '21

09 Nov '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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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 .

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Weekly call at 10:00AM Eastern
by rhaas＠illinois.edu 03 Nov '21

03 Nov '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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poster draft
by Roland Haas 31 Oct '21

31 Oct '21

Hello all, attached please find my current poster draft (with lots of plots take from previous presentations). Comments welcome. Right now that authors listed at the master branch committers. For the hydro work I can probably substitute your names rather than the institutions (seems I have enough space, even with an extra plot). 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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Carpetx-developers November 2021