Create limited schemes

agustinvo · March 8, 2021, 09:19

Hello,

there is available the limitedLinear scheme, which switchs between the linear and upwind schemes according to the gradient magnitude and the limiter you specify (at least this is what the documentation says). It is possible to develop a similar scheme, but using linearUpwind instead of upwind? It is not obvious to find the proper directories for such scheme.

Thank you in advance

Tobermory · March 8, 2021, 15:53

Just a quick sanity check - is that a good idea, Agustin? Remember, the only reason for blending in a little upwind is to stabilise the central (linear) differencing. It does this by taking advantage of the diffusive nature of the 1st order upwind scheme. I don't think that linearUpwind would have the same stabilising effect, since it is dispersive ...

agustinvo · March 10, 2021, 03:59

Hi,

I was wondering this because I found a very diffusive simulation, but I found that the problems comes from the turbulence model (too much nut) rather than the numerical schemes.

Thank you for your comment! In any case, I think it is itneresting to know this part of the OF code, I always stayed in the boundary condictions, turbulence modelling... but I never entered in this region.

Regards

March 8, 2021, 09:19	Create limited schemes	#1
agustinvo Senior Member Agustín Villa Join Date: Apr 2013 Location: Alcorcón Posts: 314 Rep Power: 15	Hello, there is available the limitedLinear scheme, which switchs between the linear and upwind schemes according to the gradient magnitude and the limiter you specify (at least this is what the documentation says). It is possible to develop a similar scheme, but using linearUpwind instead of upwind? It is not obvious to find the proper directories for such scheme. Thank you in advance

March 10, 2021, 03:59		#3
agustinvo Senior Member Agustín Villa Join Date: Apr 2013 Location: Alcorcón Posts: 314 Rep Power: 15	Hi, I was wondering this because I found a very diffusive simulation, but I found that the problems comes from the turbulence model (too much nut) rather than the numerical schemes. Thank you for your comment! In any case, I think it is itneresting to know this part of the OF code, I always stayed in the boundary condictions, turbulence modelling... but I never entered in this region. Regards Tobermory likes this.

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March 8, 2021, 15:53		#2
Tobermory Senior Member Join Date: Apr 2020 Location: UK Posts: 736 Rep Power: 14	Just a quick sanity check - is that a good idea, Agustin? Remember, the only reason for blending in a little upwind is to stabilise the central (linear) differencing. It does this by taking advantage of the diffusive nature of the 1st order upwind scheme. I don't think that linearUpwind would have the same stabilising effect, since it is dispersive ...