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solvers:dating [2012/11/14 22:18] gag [Examples] |
solvers:dating [2014/01/31 09:45] (current) ltavard [Example] |
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==== General Description ==== | ==== General Description ==== | ||
- | This page explains how to use the general AdvectionReactionSolver from the Elmer distribution to get Age/Depth relation. The AdvectionReactionSolver solves the general equation | + | This page explains how to use the general AdvectionReactionSolver from the Elmer distribution to get Age/Depth relation: |
- | dA/dt + u dA/dx + v dA/dy + w dA/dz + gamma A = source | + | <m> {{\partial A}/{\partial t}} + u . grad(A) =1 </m> |
- | In the particular case of the age equation, one has gamma = 0 and source | + | |
+ | The AdvectionReactionSolver solves the general equation | ||
+ | |||
+ | <m> {{\partial A}/ | ||
+ | |||
+ | |||
+ | In the particular case of the age equation, one has <m>gamma = -epsilon_m</ | ||
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NB: If you have a model for re-freezing at the bedrock, you also should set a DGAge = Real 0.0 on this boundary. | NB: If you have a model for re-freezing at the bedrock, you also should set a DGAge = Real 0.0 on this boundary. | ||
- | The Material section contains | + | The Material section contains |
< | < | ||
Material 1 | Material 1 | ||
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!this would be a reaction rate, | !this would be a reaction rate, | ||
- | ! in our case zero | + | ! is equal to -tr(Eij) (minus trace of the strain-rate) |
+ | ! in the case of an incompressible material (ice), it is then 0 | ||
DGAge Gamma = Real 0.0 | DGAge Gamma = Real 0.0 | ||
End | End | ||
</ | </ | ||
- | + | ==== Example ==== | |
+ | An example using the '' | ||
+ | Two tests can be also found in '' |