hallo Have anyone experiences with elliptic multiblock grid generation? I am looking for some appropriate scheme of multiblock topology file and some help how to handle special block vertices (common to more or less then 4 blocks).

Thanks.

Yup - make a vertex mapping into global vertex numbers for each block, where the merged vertex keeps a lower index. Keep looping through blocks in a big do-loop and do matching over block pairs but keep track whether addressing has changed. When it stops changing, escape from the do-loop.

Clean and easy and it will be OK no matter how many blocks share a point. On the bnegative side, you'll visit the mapping over all blocks once more than necessary, but the cost is low enough to be ignored.

Enjoy,

Hrv