[Suman Sapkota]

Hello all,

I am performing steady state analysis of free impeller of centrifugal pump. I am trying to track the particles. That being said, i have attached the geometry picture in here. The problem is when I simulate the 'old moving domain'(which consists of hub+shroud+blade) domain as "rotational" it gives me high efficiency around 85%. Now, when I use particle tracking, I need to create Blade as a separate boundary because I have to track the particles hitting the blade. Now, my rotational domain is divided into (hub+shoud) and blade. This enables me to select the end region as blade in the post processing. But I am getting low efficiency 77%. This should not be true because it is one way coupling. And when I try to interface it to the (hub+shroud), it shows the error in the picture because I am using periodic boundaries. What should I do to get my efficiency back to 85% with Blade as a separate rotating boundary inside the Moving (also rotating) boundary (hub+shroud) to solve this problem?