# Differences

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 kb:flow [2012/07/30 23:25]enviadmin kb:flow [2017/11/10 09:25] Line 1: Line 1: - ====== Flow Problems ====== - - ===== Flow Problems: Reason and Handling ===== - - With no doubt, flow problems are the number one troublemaker in simulations (at least since the turbulence model got the smart trouble shooting implemented). - - Flow problems are indicated by the ENVI-met message - - - Updating Flow:    Cancelled after XXX Steps - Warning:          Flow Module failed to convert Solution! Increase Border Grids! - - - where XXX is the selected maximum amount of iteration steps (normally 200, see [[Interface]], [[Advanced Settings Panel]]). \\ - This message indicates, that ENVI-met is not able to calculate an accurate wind field in the given model constellation. As a result of this, the model is not [[mass conserving]] at one or more points and will probably produce some kind of fatal error in the next few calculation steps. \\ - Normally one or more of the following points are the reason for this problem: - - -  The [[Total Model Height|Model Height]] is not sufficient - -  The amount of [[Nesting Grids]] is not sufficient - -  The Model Geometry is too complex - - In case of point 1 or 2, click on the link to hear more about the problem. \\ - In case of point 3, there is no general solution. Probably your model domain is very fragmented. Try to change the resolution of the model, simplify it or check, if a [[Model Rotation]] might improve the situation! - - ---- - [[kb:start|← go back to Knowledge Base Index]] \\ - **See also:** () - - ---- - -