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Numerical Diffusion in 1D Advection-diffusion solution |
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June 29, 2020, 17:20 |
Numerical Diffusion in 1D Advection-diffusion solution
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#1 |
New Member
Nabeel Khan
Join Date: Jun 2020
Posts: 1
Rep Power: 0 |
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 |
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June 29, 2020, 17:44 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,849
Rep Power: 73 |
Quote:
Could you write exactly your scheme? The plot shows a monotone and diffusive behavior typical of a first order accurate scheme |
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Tags |
advection-diffusion, fvm, numerical diffusion |
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