As a computationally cheaper mode, you can couple transient models with a sequence of steady state models: The fully transient coupling method describing the transient effects in both coupled domains leads to a highly accurate solution but might be too expensive for some applications. The main difficulty is due to the significant discrepancy of characteristic times since the transient phenomena in the fluid usually take place at a much smaller time scale than those in the solid. fluid-structure, fluid-electromagnetics, FEM structural analysis and discrete element models for particles) and the high computational time. MpCCI CouplingEnvironment offers three different methods for the data time-interpolation: constant, linear, and cubic interpolation.Ĭoupling Analysis of Mixed Solutions (Steady State and Transient)Ī fully transient coupling is challenging because of the great disparities of the physical models between the coupled domains (e.g. MpCCI CouplingEnvironment takes care of a proper ‘interpolation in time’ for the coupled physical quantities. Non-matching time step size: Codes may run at different local time stepping and also exchange data at non-matching points in time.

In this case the time step size is determined by one code and sent to the partner code, which changes its own time step to the received value. Exchange of time step size: Instead of using a fixed coupling time step size it is also possible to use adaptive time stepping.The time step size is equally defined in each application in this case and there is no need to exchange this time information. Fixed coupling time step size: In this configuration, both simulations are constrained to use the same coupling time step size during the complete co-simulation.As the solution is dominated by the time component, several co-simulation approaches are supported by MpCCI CouplingEnvironment: The fully transient analysis provides an accurate solution. pressure oscillation, heat dissipation, etc. Typical applications focus on the transient effect of the coupled solution, e.g. The coupling algorithm does not have a big influence on the solution in this case. Coupling Analysis of Steady State Solutionsįor stationary problems, it is assumed that there is exactly one solution of the coupled problem, which shall be found.

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