[zhaowei]

Hi all,


I am new to ansys cfx. I want to simulate coaxial propellers used as helicopter main rotors. When I usually set up the boundary condition manually, but I always fail for this problem, so I tried the turbomachinery simulation type. But I got a frustrating problem in this process.


I set up four domains in the simulation, Inflow, upRotor, lowRotor, and Outflow (Figure 1). But when I perform the "Axial Alignment" (Figure 2), I found that the the S1 and S2 parts separate with the rotation parts (R1 and R2) (Figure 3). If I don't perform "Axial Alignment" and go on with the next step, the interfaces between S1/R1 and S2/R2 are not recognized automatically (Figure 4). The boundary condition is recognized as in Figure 5. If I just deleted these boundary conditions and set up the interface manually, everything is OK. But when I perform the simulation, I get an error as shown in Figure 6. Is there anyone could be of help with such problem? Thanks in advance.


The mesh size for S1 and S2 are as follows:
Global Mesh Setup: 500
Boundary and Inlet: 500
Interface: 20

The mesh size for R1 and R2 are as follows:
Global Mesh Setup: 100
Boundary: 30
Interface: 40
Mesh Blade: 30