A strange result when run an IC generated by diskpy example

[wuchenglon]

I download diskpy package and generate an IC by its example , but after it get result from ChaNGa I find it shows that particles move to center of disk immediately and without Kepler velocity . Is that because of it need old version of ChaNGa like 2017 or 2018?

[trquinn]

Please describe in detail all steps needed to reproduce the problem, including versions of diskpy and changa used.

[wuchenglon]

OK , I get ChaNGa with version3.5 and latest diskpy package update in Aug 18 , 2018 . Then generate an IC from diskpy/examples/ICgen/IC_example.py and run it by ChaNGa , and I found it seems shows that all particles just move to center of disk without Kepler velocity . I generate an IC with 2100 particles and put on a disk with radius of 4.5 au , but it also seems like the previous result . The creator of diskpy suggest me to get old version ChaNGa to match it , so I wonder should I get 2017 or 2018 version ?
Thanks.