I have to import a compleate heart as a .stl-file in Ansys Workbench 18.0. Furthermore the heart has cardiac chambers inside and vessels outside. My problem is that the program is crashing all the time and the import is not working. Is it in general possible to work with .stl-files in Ansys Workbench 18.0 or do I have to convert the file as e.g. .scdoc before the import? 

Could you maybe help me? Thank you very much!