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[com1] Bingham rheology delivers unreliable results #1316

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@JuLa96

When using the Bingham rheology for the friction term in com1DFA, unrealistic high peak velocities are yielded.

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Additionally, the flowing mass shows implausible behavior. The mass is higly accelerating and at a certain point the front falls apart and single waves are flowing downstream

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Based on an initial assessment, it is suspected that the error might lie in the discretization of the shear rate $\frac{du}{dz} = \frac{3 u}{h}$. Other models like Herschel-Bulkley and O'Brien and Julien could be affected as well.

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