[CIG-MC] CitcomS -- axisymmetric geometry and dynamic topography

Eh Tan tan2 at geodynamics.org
Tue Mar 15 09:30:08 PDT 2011

Hi Juliane,

I don't know any public version of axis-symmetric mantle convection 
code. You will need to ask the authors.

You don't need to use pseudo-free surface option to compute the dynamic 
topography. The default method (consistent boundary flux) can compute 
dynamic topography accurately too. The dynamic topography can be scaled 
with the radius of earth.


On 03/09/2011 07:57 AM, julianed at jetzweb.de wrote:
> Dear Mantle Convection Community,
> my name is Juliane Dannberg. I am contacting you because I work with CitcomS and
> I have a few questions about it.
> Currently I am doing an internship at GFZ Potsdam and I work on numerical
> modeling of the Siberian LIP. I use the CitcomS code version 3.1.1 and my first
> task is to reproduce the model presented in the paper W. Leng, S. Zhong "Surface
> subsidence caused by mantle plumes and volcanic loading in large igneous
> provinces" (2010).
> In doing so I had following problems:
> For the model I try to reproduce another version of Citcom was used which makes
> it possible to apply a 2D axisymmetric geometry. So I wanted to ask if there is a
> way to use this geometry in CitcomS or if there are older versions of Citcom that
> include such options. If there is such an older version I would be really happy
> if someone could send it to me or if someone could tell me where to download it.
> That would be great.
> I also try to compute dynamic topography. But I have problems using the
> pseudo-free surface option because I always get the message that the solver is
> not converging. Maybe you have some advice for me how I could improve this. And
> if I use the free slip surface boundary condition it is working but I wonder how
> I can translate the dimensionless units of topography back to meters because I
> found nothing about it in the manual.
> I would be very happy if you could give me some advice.
> Thank you for your help!
> Regards,
> Juliane Dannberg
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