the temperature of the bottom of the bed of the ice

Extension of Elmer in computational glaciology

the temperature of the bottom of the bed of the ice

Postby zhang liangfu » 13 Oct 2015, 13:39

Hi every one,
I was doing some research in the temperature of the antarctic ice sheet,I add the temperature as the website said
Code: Select all
http://elmerice.elmerfem.org/wiki/doku.php?id=solvers:temperature
.
Every thing goes well ,but when I want to obtain the temeprature,the problem occurs.the temperature of the bottom is 274 but the pressure melting point I set was
!! pressuremeltingpoint (in SI units)
$ function pressuremeltingpoint2(D) {\
P = 910*D*9.81;\
if (P<0.0) P=0.0;\
beta=9.8E-08;\
_pressuremeltingpoint2=273.15-(beta*P);\
}

In my opinion ,the temperature must be under the pressure melting point,the results I obtain as follows:
[img]
[/img]
By the way ,I also have some questions about the parameter of the glen's law .in my sif file I set the parameters as follows:
! Prefactor from Cuffey and Paterson (2010) in MPa^{-3} a^{-1}
$A1 = 1.258e13
$A2 = 6.046e28
$Q1 = 78.80e3
$Q2 = 139.0e3

I do not know where I can obtain these parameters or what parameters should I set .
I am a newer,any help is welcome

looking forward to everyone of you
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zhang liangfu
 
Posts: 22
Joined: 20 Nov 2014, 05:06

Re: the temperature of the bottom of the bed of the ice

Postby joeatodd » 15 Oct 2015, 14:12

Hey,

For the temperature problem, did you set the following in the temperature solver section?
Code: Select all
Loop While Unconstrained Nodes = Logical True


For the values of the parameters you mention, reasonable values are listed on this page:
http://elmerice.elmerfem.org/wiki/doku. ... rheology&s[]=glen
joeatodd
 
Posts: 34
Joined: 02 Feb 2012, 18:49


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