linda sim - static sphere - updates H line optical depth VERY slowly (trac #132)

[cloudy-bot]

reported by: @CloudyLex

the linda.in sim reported by linda strubbe is very slowly converging the H line optical depths. it is an optically thin static sphere which has not been well tested - all we test are either optically thick or not static/sphere.

initial H optical depth guess is large, but first iteration is thin. thereafter code uses the "far side" optical depth from previous iteration. it should double the face to face optical depth instead.

any optically thin static sphere will show this problem - look at old, new H line optical depths in attached sim which runs very quickly

Migrated from https://www.nublado.org/ticket/132

{
    "status": "new",
    "changetime": "2019-02-04T13:07:35Z",
    "_ts": "1549285655953282",
    "description": "the linda.in sim reported by linda strubbe is very slowly converging the H line optical depths.  it is an optically thin static sphere which has not been well tested - all we test are either optically thick or not static/sphere.\n\ninitial H optical depth guess is large, but first iteration is thin.  thereafter code uses the \"far side\" optical depth from previous iteration.  it should double the face to face optical depth instead.\n\nany optically thin static sphere will show this problem - look at old, new H line optical depths in attached sim which runs very quickly",
    "reporter": "gary",
    "cc": "",
    "resolution": "",
    "time": "2010-02-10T12:11:42Z",
    "component": "radiative transfer",
    "summary": "linda sim - static sphere - updates H line optical depth VERY slowly",
    "priority": "major",
    "keywords": "",
    "version": "trunk",
    "milestone": "no milestone",
    "owner": "nobody",
    "type": "defect - convergence"
}

[cloudy-bot]

@CloudyLex changed attachment from "" to "sphere.in"

[cloudy-bot]

@CloudyLex changed description from:

the linda.in sim reported by linda strubbe is very slowly converging the H line optical depths. it is an optically think static sphere which has not been well tested - all we test are optically thick or not static/sphere.

initial H optical depth guess is large, but first iteration is thin. thereafter code uses the "far side" optical depth from previous iteration. it should double the face to face optical depth instead.

any optically thin static sphere will show this problem - look at old, new H line optical depths in attached sim which runs very quickly

to:

the linda.in sim reported by linda strubbe is very slowly converging the H line optical depths. it is an optically thin static sphere which has not been well tested - all we test are either optically thick or not static/sphere.

initial H optical depth guess is large, but first iteration is thin. thereafter code uses the "far side" optical depth from previous iteration. it should double the face to face optical depth instead.

any optically thin static sphere will show this problem - look at old, new H line optical depths in attached sim which runs very quickly

[cloudy-bot]

• @ryan-porter-noaccount commented:

Removing stale milestone and downgrading priority.

• @ryan-porter-noaccount changed milestone from "C10 release" to ""
• @ryan-porter-noaccount changed priority from "blocker" to "major"

[cloudy-bot]

@peter-van-hoof-noaccount changed milestone from "" to "no milestone"