Dear all. I was focusing on modeling stress wave propagation by coupling Flac3D and PFC3D. There were two ways: zone-ball coupling and zone-wall coupling. The way of zone-ball coupling worked well in modeling wave propagation. However, I met a problem when using the zone-wall method. If the model with balls surrounded by zones in 5 directions (the first figure), it worked well. It will go wrong if the model with balls touching zones on one face (the second figure). Can you tell me how to deal with this problem?
