[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: "David L Parkhurst" <dlpark@xxxxxxxx>*Subject*: Re: bernd*From*: "Bernd Ehret" <bernd.ehret@xxxxxxxxxxxxx>*Date*: Wed, 4 Sep 2002 17:32:02 +0200*Disposition-notification-to*: "Bernd Ehret" <bernd.ehret@tu-cottbus.de>*In-reply-to*: <OF8670DD94.F581F20B-ON87256C29.0056F9BE@usgs.gov>*References*: <OF97D07B7F.39CA78C4-ON87256C2A.004AD95D@cr.usgs.gov>

thank you
!!

answer with file tomorrow

Bernd

----- Original Message -----

From: "David L Parkhurst" <dlpark@xxxxxxxx>

To: "Bernd Ehret" <bernd.ehret@xxxxxxxxxxxxx>

Sent: Wednesday, September 04, 2002 3:45
PM

In-Reply-To: Subject: Re: bernd

> Very large mixing fractions (100000) will probably cause numerical

> problems; fractions < 10 or even 100 should be ok provided the solutions

> start with about 1 kg water.

>

>

> > Which fractions I have to use if some Deka or even millions of cubic

> meter of

> water are to be mixed ?

>

> You will have to use representative volumes, summing to 1 is preferable.

>

> > With the results from the MIX steps mentioned above I couldn't estimate

> which kind

> of fractions give the right answer.

>

> For pure mixing, results should be the same with the same proportions. I

> would have to see a complete input file, hopefully not too complicated, to

> tell you what is going on.

>

> David

>

> David Parkhurst (dlpark@xxxxxxxx)

> U.S. Geological Survey

> Box 25046, MS 413

> Denver Federal Center

> Denver, CO 80225

>

> Project web page: http://wwwbrr.cr.usgs.gov/projects/GWC_coupled

>

>

>

>

> "Bernd Ehret"

> <bernd.ehret@xx- To: "David L Parkhurst" <dlpark@xxxxxxxx>

> Cottbus.De> cc:

> In-Reply-To:

> 09/04/02 04:51

> AM

>

>

>

>

>

> From many tests with MIX I got different results for the same mixing

> fractions

> of the input solutions, for example:

>

> MIX 1

> # 0 0.1

> # 1 0.15

> # 2 0.25

> # 3 0.5 -> norm 1

>

> # 0 100000

> # 1 150000

> # 2 250000

> # 3 500000 -> no convergence

>

> 0 7.2

> 1 10.8

> 2 18.0

> 3 36.0 -> no convergence

>

> # 0 0.072

> # 1 0.108

> # 2 0.180

> # 3 0.360 -> different results as with first fractions

> SAVE solution 1001

> END

>

> MIX 2

> # 0 0.1

> # 1 0.2

> # 2 0.3

> # 1001 0.4

>

> # 0 100000

> # 1 200000

> # 2 300000

> # 1001 400000

>

> 0 7.2

> 1 14.4

> 2 21.6

> 1001 28.8

>

> # 0 0.072

> # 1 0.144

> # 2 0.216

> # 1001 0.288

> SAVE solution 1002

> END

>

> MIX 3

> # 0 0.1

> # 1 0.25

> # 2 0.35

> # 1002 0.3

>

> # 0 100000

> # 1 250000

> # 2 350000

> # 1002 300000

>

> 0 7.2

> 1 18.0

> 2 25.2

> 1002 21.6

>

> # 0 0.072

> # 1 0.180

> # 2 0.252

> # 1002 0.216

> SAVE solution 1003

> END

>

> My conclusions are:

> -the mixing fractions may not be to large, that is not >> 1

> -norm to 1.0 gives other results than without norm

>

> The question is:

> Which fractions I have to use if some Deka or even millions of cubic meter

> of

> water are to be mixed ?

> With the results from the MIX steps mentioned above I couldn't estimate

> which kind

> of fractions give the right answer.

>

> Bernd

>

>

>

>

>

**Follow-Ups**:**Re: bernd 050902***From:*Bernd Ehret

**References**:**Re: bernd***From:*David L Parkhurst

- Prev by Date:
**Re: O2(g) Minteq** - Next by Date:
**Re: bernd 050902** - Previous by thread:
**Re: bernd** - Next by thread:
**Re: bernd 050902** - Index(es):

Project Home Page

Complete Water Resources Division Software

USGS Home Page

Water Resources Division Home Page

NRP Home Page

Help Page

Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.

The URL of this page is:
http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/mail/msg00057.html

Email:dlpark@usgs.gov

Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $

Visitor number 1413 since Jan 22, 1998.