[mesa-users] numerical noise (chenhl)

Jérôme Quintin JQUINTIN10 at ubishops.ca
Thu Jun 6 11:11:32 EDT 2013


Hi Hailiang,

Reducing the time steps could help reducing the noise in Mdot. To do that, you can modify max_yrs_dt in your inlist_rlo. I think that the default value is 1d9, so you could easily put something much smaller and run the evolution in a decent time and have much less noise. I hope that helps.

Cheers,

Jérôme Quintin


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Today's Topics:

   1. numerical noise (chenhl)
   2. Fwd:  numerical noise (chenhl)


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Message: 1
Date: Thu, 6 Jun 2013 15:14:02 +0200
From: chenhl <chlcrazyboy at gmail.com>
Subject: [mesa-users] numerical noise
To: "mesa-users at lists.sourceforge.net"
        <mesa-users at lists.sourceforge.net>
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        <CAAZpfSLB88zeUHrQbRBG1YLO68XiaBANLqOEcaFicT7BstGSdA at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Dear all,

I am using MESA for binary evolution. But I found a lot of numerical noise
in the calculation. For example, the mass transfer rate curve. Is there any
way to reduce the noise and make the curve smooth?

Best wishes,
Hailiang
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Message: 2
Date: Thu, 6 Jun 2013 17:02:55 +0200
From: chenhl <chlcrazyboy at gmail.com>
Subject: [mesa-users] Fwd:  numerical noise
To: "mesa-users at lists.sourceforge.net"
        <mesa-users at lists.sourceforge.net>
Message-ID:
        <CAAZpfSKqmf26LYXaTrG=C4=xoAm-OBRboVJm5e6ygh3r4FA3uA at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Sorry for not describing the problem clearly.

The attached plot is an example that shows mass transfer rate evolution in
a binary evolution calculation.
In the plot, the noise should be artificial. I think this problem should be
independent
of system and mesa version, since I have tried on different systems and
different mesa
version.  My question is how to reduce the noise in the plot.

Best wishes,
Hailiang
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