By Spyros N. Pnevmatikos (Eds.)

Edited Spyros N. Pnevmatikos. (ed.) Singularities & dynamical platforms (c1985)(ISBN 0444876413)(O)(467s)

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Due to this restriction, the inﬂuence of the physical parameters is important for the stability criteria. One such condition is the Courant-Friedrichs-Lewy [CFL] condition, see [51], in which no explicit, unconditionally stable, consistent ﬁnite diﬀerence schemes for hyperbolic initial value problems exist. So the CFL condition gives the relation between the spatial and the time discretization with respect to the physical parameters, for which we have unconditionally stable results. This condition can be used for decoupling the equations into diﬀerent operators, when they present diﬀerent timescales.

21) where i is the spatial discretization index of the grid nodes. 2D We have the following scales: for the diﬀusion operator, we have Δx 2 , and for the reaction operator we have λ. We decouple both operators, if the conditions 2D 2D Δx2 << λ or Δx2 >> λ are met. If the scales are each approximate, we neglect the decoupling. 5 The scales of the operators can be changed, if we assume a higher-order discretization in space or ﬁner spatial grids. Therefore, the balance between the order of the time and space discretization is important and should be made eﬃcient.

In our contributions, we deal with the physical decomposition, which is more applied. In the next section we introduce the numerical analysis for the decomposition methods. 4 Numerical Analysis of the Decomposition Methods The underlying model equations for the multi-physics problems are evolution systems of partial diﬀerential equations. To solve such equations, numerical methods as discretization and solver methods have to be studied. We concentrate on the coupling of the equation systems and study decoupled equations with respect to large time-steps.