Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: load case Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers on Fluid Transient Load case Dialog screen: Note: see additional comments about Time history analysis in AutoPIPE on the following WIKI's: Water Hammer (Time History) Example - Modeling Approach in AutoPIPE Dynamic Analysis - Time History load case in AutoPIPE Item #1: On the Load Time History Location dialog screen, change value at node (ex. C14 N) from Dy = -1 to Dy = -10 and there is no change in the results, but if change Dy = 0, there is a change in the results. Why? Answer: From the online help: DX/DY/DZ Specify the direction cosines or offsets of the time history load (i.e., values of 1,0,0 would specify the X-direction as the direction at which the time history load is applied. Therefore, changing Dx =0, Dy = -1, Dz = 0, to Dx =0, Dy = -10, Dz = 0, has no affect on the direction cosines, the load is still going to be applied in the -ve Dy direction regardless if Dy in this case is any number -1 to -infinity. In addtion, by setting Dx =0, Dy = -1, Dz = 0, to Dx =0, Dy = 0, Dz = 0, will have a significant change on the results as there is now no directional cosine specified for the load. If there was another direction with a value, Dx =1, Dy = -1, Dz = 0, to Dx =1, Dy = -10, Dz = 0, is a significant change in the directional cosine. Thus changing the results. See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
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