heat transfer in my granular simulation

I am doing simulation of heat transfer in granular powder particles that are falling (Ex. in.chute_wear) but after simulation temperature values are significantly as high as 10^15 magnitude without applying any additional heat source and simply applied NVE integration . I think these values are unrealistic how to decrease this temperature values so that it resembles realistic scenario and how these values are computed under the background???
I will provide input script and output values on the terminal pls somebody guide me and help me to resolve this issue.