At first, I hope you are farmiliar with AUTODYN.I have a model which is in the format of stl . It is difficult to input into AUTODYN directly. Because only .k or .gon 、zon file is acceptable. So how to convert the file ? I have tried ICEM CFD。It is time comnsuming and it is difficult to learn the software in short time. To be honest, the problem troubles me for about two months........ Any help or attention is appreciated. zhihzuo