Hello

I have attached a screenshot and as you can see there is a hole in my part and i dont know how to fill it.
I have tried the surface>fill and Knit to fill it but i couldnt. please help me

and one more unrelated question that i have is that the part i have in solidworks is so detailed that i have problem with it in ansys and analyzing it is so hard and takes a lot of time. is there a way to fix that too? ansys always stops working when i try to add this part.

sorry but im an amature in solidworks