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*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

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