Model:SNAC

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SNAC

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Single Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 3D Spatial extent Continental, Landscape-Scale, Regional-Scale Model domain Terrestrial, Geodynamic One-line model description An updated Lagrangian explicit finite difference code for modeling a finitely deforming elasto-visco-plastic solid in 3D. Extended model description SNAC can solve momentum and heat energy balance equations in 3D solid with complicated rheology. Lagrangian description of motion adopted in SNAC makes it easy to monitor surface deformation during a crustal or continental scale tectonic event as well as introduce surface processes into a model. Keywords: Name Eunseo Choi Type of contact Model developer Institute / Organization Lamont-Doherty Earth Observatory Postal address 1 P.O. Box 1000 Postal address 2 61 Rt. 9W Town / City Palisades Postal code 10964 State New York Country United States Email address echoi@ldeo.columbia.edu Phone 845-365-8813 Fax 845-365-8156 Supported platforms Linux, Mac OS Other platform Programming language C Other program language Code optimized Single Processor, Multiple Processors Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2003 Does model development still take place? Yes If above answer is no, provide end year model development Code development status Active When did you indicate the 'code development status'? 2020 Model availability As code Source code availability (Or provide future intension) Through web repository Source web address http://www.geodynamics.org/cig/software/snac/ Source csdms web address Program license type GPL v2 Program license type other Memory requirements tipically < 1 GB Typical run time hours to days Describe input parameters In XML format, the following groups of parameters are specified: simulation control group: total model time, time step, damping, etc. plugins: elasticity, viscoelasticity, temperature solver, etc. domain description group: domain size, element numbers, etc. initial and boundary conditions group Input format ASCII Other input format XML Describe output parameters Nodal field data: velocity, temperature Element-centered (discontinuous) field data: strain rate, stress, plastic strain, etc. Output format Binary Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? Yes Describe post-processing software A simple C program that converts binary outputs into ascii data file in the VTK format. Visualization software needed? Yes If above answer is yes Other visualization software ParaView or anything that can visualize VTK files. Describe processes represented by the model Momentum balance in solid continuum under gravity and kinematic boundary conditions. Describe key physical parameters and equations Newton's second law in the dynamic form is damped to acquire static or quasi-static solutions. Among importance parameters are those for a constitutive model (elastic moduli, linear and non-linear viscosity, and parameters for strain-weakening plasticity) and damping parameters. Describe length scale and resolution constraints No inherent length scale or resolution as long as the continuum hypothesis is satisfied. A practical constraint on length scale and resolution is computational cost. Describe time scale and resolution constraints Time scale is essentially set by the Courant condition: practially by P-wave velocity or maxwell time according to the constitutive model being considered. However, the mass scaling technique allows significantly increased time steps values from the usual dynamic one. Describe any numerical limitations and issues Extreme deformation of mesh is expected during large deformationin the updated Lagrangian formulation but prevented by regridding. The numerical diffusion due to regridding, however, can sometime make structures (e.g. shear localization) lose desired sharpness. Regridding itself fails from time to time. Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets Upload test data sets if available: Describe ideal data for testing Do you have current or future plans for collaborating with other researchers? Is there a manual available? Yes Upload manual if available: Media:Snac.pdf Model website if any http://www.geodynamics.org/cig/software/snac/ Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant No but possible BMI compliant No but possible WMT component No but possible PyMT component Is this a data component Can be coupled with:

Model info Authors Eunseo Choi Source code Go to external source code site Model citations Nr. of publications: 3 Total citations: 108 h-index: 2 m-quotient: 0.12 QR-code Link to this page Other models by author SNAC

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Nr. of publications:	3
Total citations:	108
h-index:	2
m-quotient:	0.12

Featured publication(s)	Year	Model described	Type of Reference	Citations
Choi, Eun-seo; Lavier, Luc; Gurnis, Michael; 2008. Thermomechanics of mid-ocean ridge segmentation. Physics of the Earth and Planetary Interiors, 171, 374–386. 10.1016/j.pepi.2008.08.010 (View/edit entry)	2008	SNAC	Model overview	68
Choi, Eunseo; Buck, W. Roger; 2012. Constraints on the strength of faults from the geometry of rider blocks in continental and oceanic core complexes: RIDER BLOCKS AND FAULT STRENGTH. Journal of Geophysical Research: Solid Earth, 117, n/a–n/a. 10.1029/2011JB008741 (View/edit entry)	2012	SNAC	Model application	39
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