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Showing results 1 to 10 of 10 Search took 0.00 seconds. Search: Posts Made By: FMDenaro

Forum: Main CFD Forum October 25, 2021, 13:15

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro Well, that is difficult to explain if you don't... Well, that is difficult to explain if you don't have a basic knowledge of CFD. The cfl is a parameter governing the numerical stability for explicit schemes but in case of implicit scheme you can...

Forum: Main CFD Forum October 25, 2021, 08:36

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro Yes, ideed you see a scaling due to the time step... Yes, ideed you see a scaling due to the time step you have to consider. This issue is discussed here in the section of numerical test ...

Forum: Main CFD Forum October 25, 2021, 07:17

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro No matter about the derivatives, to be consistent... No matter about the derivatives, to be consistent the analysis you need that they are always O(1) in time and space.

Forum: Main CFD Forum October 25, 2021, 07:06

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro No, you evaluate the discretization error... No, you evaluate the discretization error ed=dt*lte

Forum: Main CFD Forum October 25, 2021, 06:24

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro The temporal accuracy study can be performed also... The temporal accuracy study can be performed also for a single time step!

Forum: Main CFD Forum October 24, 2021, 14:31

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro Why not? The flow rate is only an integral... Why not? The flow rate is only an integral quantity computed from your second order accurate velocity, you need only to take care in computing it at second order of accuracy and compare to the exact...

Forum: Main CFD Forum October 22, 2021, 09:24

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro I try to be more rigorous. The local... I try to be more rigorous. The local truncation error defines the accuracy order of the scheme. I suppose you are evaluating the discretization error from a known and available exact solution....

Forum: Main CFD Forum October 21, 2021, 16:06

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro In any run, you have the same constant error in... In any run, you have the same constant error in space. If it is greater than the magnitude of the error in time, you will see only the constant slope. For this reason you need to get this constant...

Forum: Main CFD Forum October 21, 2021, 15:29

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro the local truncation error has terms that depend... the local truncation error has terms that depend on the time and space step sizes, when you fix the h size you have as a consequence that the spatial contribution is constant. When you reduce the...

Forum: Main CFD Forum June 4, 2013, 04:01

Replies: 50 Time step independence study for transient CFD simulation Views: 9,815 Posted By FMDenaro My opinion is that one should see the structure... My opinion is that one should see the structure of the local truncation error. It is done by a combination of power of time step and spatial step, a rigorous theoretical estimation of the consistence...

Showing results 1 to 10 of 10

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