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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: FMDenaro

Forum: Main CFD Forum April 23, 2015, 18:43

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro Without details is not possibile to help you... I... Without details is not possibile to help you... I suppose you are not correctly setting the pressure gradient at the boundary. Are you using the correct normal component inserted in the Hodge...

Forum: Main CFD Forum April 23, 2015, 17:46

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro could you better elaborate your model? I think... could you better elaborate your model? I think you are not correctly setting the BC.s. You can check if the compatibility relation is numerically satisfied

Forum: Main CFD Forum March 30, 2014, 09:10

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro Sorry, I do not understand clearly this point ...... Sorry, I do not understand clearly this point ... at each time step I will solve the pressure equation (double precision) even with a simple SOR method. With the pressure gradient I can drive the...

Forum: Main CFD Forum March 30, 2014, 05:29

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro ok, now I see what you meant. However, let me... ok, now I see what you meant. However, let me address some issues. 1) Also in practice, the Div V = 0 constraint can be reached at machine precision. It depend on your choice, if you want to adopt...

Forum: Main CFD Forum March 29, 2014, 13:48

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro Could You elaborate? Could You elaborate?

Forum: Main CFD Forum March 25, 2014, 17:34

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro Since the pressure equation is derived from the... Since the pressure equation is derived from the continuity equation Div V = 0 the source term is necessarily in the form of divergence ... The question for a general function q I think that...

Forum: Main CFD Forum March 25, 2014, 17:15

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro to tell the truth I don't understand that... to tell the truth I don't understand that question clearly ... the key is the numerical construction of the surface integral of dp/dn that must balance the volume integral of the source term whatever...

Forum: Main CFD Forum March 25, 2014, 16:10

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro just to say that while using a FV-based flux... just to say that while using a FV-based flux discretization I checked in my codes that it automatically ensures the compatibility constraint (in discrete sense) without any correction..

Forum: Main CFD Forum January 28, 2014, 17:18

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro Adrin, something in the BC implementation could... Adrin, something in the BC implementation could be wrong... I assume you are working on the pressure problem derived from the continuity equation in which you substitute the Hodge decomposition. The...

Forum: Main CFD Forum January 28, 2014, 16:55

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro Let me say that the correct way to fix a value... Let me say that the correct way to fix a value must accord with the correct BCs otherwise you get convergence towards some uncorrect solution Try to fix the value not in the interior but by entering...

Forum: Main CFD Forum January 28, 2014, 03:36

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro well, this is not an issue of CFD but a... well, this is not an issue of CFD but a mathematical property... The Poisson equation Div Grad (phi) = q with Neumann BC.s admits a solution (apart a constant) provided that the compatibility...

Forum: Main CFD Forum January 27, 2014, 13:56

Replies: 39 Poisson equation,Neumann BCs Views: 8,780 Posted By FMDenaro You can fix the value of the solution in anyone... You can fix the value of the solution in anyone of the grid points. However, this is not necessary, the system admits infinite solutions and during a linear solver, your solution automatically sets...

Showing results 1 to 12 of 12

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