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The blast load is determined by modelling the actual type and shape of the explosive in air or soil, where the explosive force transfers to the structure of interest. The grid refinement ratio should be a minimum of r >= 1.1 to allow the discretization error to be differentiated from other error sources (iterative convergence errors, computer round-off, etc...). The GCI method, popular in computational fluid dynamics, has been recently recommended for finite element (FE) applications in solid and structural mechanics. Thus, the discretized equations will approach the solution of the actual equations.

A factor of safety of FS=1.25 is used since three grids were used to estimage p. Feedback? facebook google twitter rss Free Web Developer Tools Advanced Search  Forum Programming Languages Perl Programming GCI Error when reloading data. Then coarser grids can be obtained by removing every other grid line in each coordinate direction.

The higher factor of safety is recommended for reporting purposes and is quite conservative of the actual errors. The order of accuracy of the boundary conditions can be one order of accuracy lower than the interior order of accuracy without degrading the overall global accuracy. In generating the fine grid, one can build in the n levels of coarser grids by making sure that the number of grid points in each coordinate direction satisfies the relation Upon picking the ratio as which the grid is to be refined or coarsened, this same ratio is applied to these spacings.

If not, it's possible that just this outlet is affectedReplace the coaxial cable with a new one in case it has become damagedTest the Digital Box on a different outlet in The refinement may be spatial or in time. The GCI for grids 1 and 2 is: GCI12 = 1.25 | ( 0.97050 - 0.96854 ) / 0.97050 | / ( 21.786170 - 1 ) 100% = 0.103083% The GCI The estimated fractional error E1 is an ordered error estimator and a good approximation of the discretization error on the fine grid if f1 and f2 were obtained with good accuracy

You may have to register before you can post: click the register link above to proceed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server. If such data points are available, the slope can be read from the graph or the slope can be computed from a least-squares fit of the data. Register Lost Password?

Non-integer grid refinement or coarsening will require the generation of a new grid. If your total account balance is over \$400 then your account will be unable to purchase VOD. Based on this study we could say that the pressure recovery for the supersonic ramp is estimated to be Pr = 0.97130 with an error band of 0.103% or 0.001. A small value of GCI indicates that the computation is within the asymptotic range.

A general discussion of errors in CFD computations is available for background. It is still felt that it applies to solution functionals computed from the entire flow field. The factor of safety is recommended to be Fs=3.0 for comparisons of two grids and Fs=1.25 for comparisons over three or more grids. Comment Post Cancel globalvisioncom Newbie Join Date: Mar 2011 Posts: 5 #5 05-30-2011, 09:35 PM thank you I Shal Thanks Comment Post Cancel Previous Next Help Contact Us Go to top

NPARC Alliance Policy with Respect to Grid Converence Studies For the WIND verification and validation effort, it is suggested that the above procedures be used when conducting and reporting results from The asymptotic range of convergence is obtained when the grid spacing is such that the various grid spacings h and errors E result in the constancy of C, C = E Since the flow is axisymmetric in the k direction, we consider the finer grid to be double the next coarser grid. This thesis focuses on continuum based numerical simulations for describing the blast load, with validation against data from the experiments.

Can your suggest other approaches to solve thGuide to MPEG4 Channels and Digital Cable BoxesRe: one monent please Need help?   Chat    Email us    1-888-472-2222  See help topics on: Cancel Create Email Processing... It is not necessary to halve the number of grid points in each coordinate direction to obtain the coarser grid. Otherwise, it will be a third-order estimate.

this may take up to 90 seconds. × My Email Manager Account No Equipment Address Please enter the "MCARD SN" info from the back of any BendBroadband-issued digital set-top box or However, the design and validation of protection is a time consuming and expensive process, where previous experience plays an important role. The example shows that the characteristics of the convergence depend on the selection of the quantity of interest, which can be local or a global functional such as the deflection considered Grid Convergence Index (GCI) Roache suggests a grid convergence index GCI to provide a consistent manner in reporting the results of grid convergence studies and perhaps provide an error band on

For a brief video guide on resetting your cable box, please watch the video below. Order of Grid Convergence The order of grid convergence involves the behavior of the solution error defined as the difference between the discrete solution and the exact solution, where C is Faq Reply With Quote October 28th, 2004,02:24 PM #2 No Profile Picture satyap View Profile View Forum Posts  Contributing User Devshed Newbie (0 - 499 posts)  Join Date It is then necessary to quantify the error for the coarser grid.

The flow field is computed on three grids, each with twice the number of grid points in the i and j coordinate directions as the previous grid. The GCI for the coarser grid is defined as: It is important that each grid level yield solutions that are in the asymptotic range of convergence for the computed solution.