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Basics : Weak thermal coupling

Besides the monolithic thermal coupling method, it is also possible to trigger a weak/loose explicit method between the structure and the fluid. The choice between the two methods can be made using ICFD_CONTROL_CONJ. This method may offer an alternative for lower computational time but a finer mesh may be necessary to achieve the same level of accuracy especially in the wall region. Similarly, the thermal and fluid timesteps may be independent but it is recommended to keep them close in highly non linear configurations. Regardless of the chosen coupling method, it is also possible to extract the heat transfer coefficient at the interface using ICFD_DATABASE_HTC. The user is encouraged to switch between the two coupling methods and compare.