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July 30, 2011, 10:02 |
Lax-Friedrichs flux
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#1 |
New Member
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Join Date: Apr 2011
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Have anyone a paper which explain how lax-friedrich(approximate riemann solver) is derived?
Also if we suppose that (u+) is the values of a volume , (u-) the values of neighbour volumes and F the flux then the lax-friedrichs flux gives: F=0.5*( (F+) + (F-) ) - a*( (u-) - (u+) ) This is applied by all faces of a initial volume regardless of its outward unit vector? |
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July 30, 2011, 12:45 |
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#2 |
Senior Member
cfdnewbie
Join Date: Mar 2010
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There's nothing too fancy about the LF-flux....its the average, penalized by the jump to add a strong dissipative constant.... not sure about the original paper, anybody has a hint???
you compute your F by the formula given above, and then do int (F*n) dx to take the normal into account... hope this helps a bit! |
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July 30, 2011, 17:09 |
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#3 |
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Yes , sure. The third term is the dissipative term. Simply , i did not know if it has a complex theory under of it (due to appearance of eigenvectors as dissipative multiplier). With other words, i want to learn what assumptions do for to solve approximate the Riemann problem and finally result at this simply relation.
For other cases as HLLC or HLL there is a assumption on a number of waves. Here? |
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July 31, 2011, 03:52 |
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#4 |
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