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Explicit converging faster compared to implicit |
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January 20, 2012, 04:43 |
Explicit converging faster compared to implicit
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#1 |
New Member
C.Harish
Join Date: Jun 2011
Posts: 15
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Hello, can anyone tell me are there any cases where the explicit scheme converges faster compared to implicit, if so why does that happen?
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January 20, 2012, 17:16 |
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#2 |
Senior Member
cfdnewbie
Join Date: Mar 2010
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If the physical timestep is very small, i.e. close to the explicit time step, explicit schemes will be faster.
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January 21, 2012, 04:14 |
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#3 |
New Member
C.Harish
Join Date: Jun 2011
Posts: 15
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Thanh for d reply cfdnewbie. Can u just eloborate it a bit more...also some of d example cases if u can...
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January 21, 2012, 10:58 |
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#4 |
Senior Member
cfdnewbie
Join Date: Mar 2010
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it totally depends on your physics, your implementation and your hardware. It is not clear-cut, so there's no classical example. The smaller the timescales governing the flow, the larger your available number of cpus, the likelier the explicit scheme is to outperform the implicit one.
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January 22, 2012, 16:57 |
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#5 | ||
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Quote:
Explicit schemes are faster at each time-step since they do not need to solve a system of equations. However, implicit schemes can take much larger time-steps. If you have implicit treatment of the non-linear terms then you also need some way to deal with this. So basically: Quote:
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January 23, 2012, 07:00 |
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#6 |
New Member
C.Harish
Join Date: Jun 2011
Posts: 15
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i mean its convergence to the steady state.
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