POLYFLOW - Tip to workaround the error: "The number of segments is not identical on each front", for free surface flow with streamwise remeshing.

A calculation involves a free surface and the streamwise remeshing technique is used. Actually the free surface sees the die on more than one boundary.
The calculation immediately stops, and generates the error message. How to circumvent this?
Most probably this comes from the fact that the free surface is actually attached to two borders. The remedy would consist of splitting the free surface into two parts that are topologically in the continuation of their respective attachement line, as suggested on the figure http://www.eureka.im/downloads/boundaried_298.png

On the image, one sees that the free surface is split into two borders (light grey and blue), respectively connected to the dark grey and orange die borders.

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