cfx strange error
I am trying to simulate the propagation of particles in the last few meters of a reservoir (incluind the dam section) using the algebraic slip model and I am receiving the following error message:
++  ERROR #001100279 has occurred in subroutine ErrAction.   Message:   Stopped in routine FPX: c_fpx_handler   Does anyone knows what causes this? I have defined the following boundary conditions:  at inlet velocity and the mass fraction; at the outlet a smooth no slip wall; at the bottom and the lateral parts of the model a rough no slip wall in the top of my domain I have specified an opening boundary with the following features: relative pressure equal to the height of the flow that is above of my domain pressure option assigned to opening pressure low turbulence intensity mass fraction equal to zero In doing so, I am trying to model not the entire height of the dam but just a few meters from the bottom (where the sediments will be accumulated). Furthmore, I have defined the reference pressure equal to the pressure correponding to the height of the flow above the domain, velocities equal to zero, an hydrostatic pressure distribution, and mass fraction equal to zero as initial conditions. What can be wrong in this approach?Many thanks. 
at the top boundary I have choosed the entrainment option

Is it a floating point error? If so then this means your simulation has diverged. Need to improve numerical stability.

It is a floating point error and a little bit surprisingly (at least for me) by changing the initial level of turbulence in domain the error disappears. I had k=epsilon=0 and now I have low level of turbulence (I=1%)..

You cannot have epsilon = 0. It leads to a divide by zero error on the turbulent viscosity  ie a floating point error :) This does not sound surprising at all to me.

Well seen.

Well, the e based turbulence model cannot have epsilon=0 as the turbulent viscosity goes undefined. This is a key failing of these models and is why they cannot model low Re flows or transitional flows. This is one of the key advantages of omage based turbulence models, and why the omega turbulence models are used in the vast majority of these sort of flows.
So not so much a "well seen" as an example of a well known fundamental failing of epsilon based turbulence models. 
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