[nabeelk04]

I used Finite Volume method and switched diffusion term off, but still I'm getting false diffusion in numerical solution for 1D case.

I understand it's occuring due to truncation error, I also tried using very small conntrol volume and very small time steps but still the error in solution is very high. I used 2nd order accurate discritization as suggested by Patanker in Numrical Heat Transfer and Fluid Flow

Please guide me how to reduce the error.

Please look at the video of simulation: https://drive.google.com/file/d/1nrl...ew?usp=sharing