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  • How does HAMMER calculate vapor pocket formation and collapse?

    Applies To Product(s): HAMMER Version(s): All Area: Calculations Original Author: Jesse Dringoli, Bentley Technical Support Group Problem How does HAMMER calculate vapor pocket formation and…
  • HAMMER Transient wave reflection behavior for different boundary conditions

    Product(s): HAMMER Version(s): CONNECT Edition Area: Calculations Problem During a transient simulation in HAMMER, how do transient waves reflect off different boundary conditions, such as demands, reservoirs or dead ends…
  • Hammer results File doesn't contain any transient extended node.

    Hi, I am new to Bentley Hammer. I am analyzing a Gravity pipeline where water will run from 1619 m elevation to 1400 m elevation in a hilly area with ups and downs. When I check " Transient Results Viewer" it gives a dialogue box. "The hammer results…
  • inserimento air valve dopo evento transitorio arresto pompa (ho bisogno di aiuto)

    buongiorno, dopo tante domande siamo quasi arrivati alla fine del problema. Dopo aver calcolato un'analisi transitoria di arresto di una pompa con numero di giri variabile ho problemi relativi alla cavitazione e quindi ho inserito dove ho questi problemi…
  • evento transitorio spegnimento pompa velocità variabile

    buonasera, ho riscontrato due errori in questa simulazione: 1) problema cavitazione 2) analizzando i risultati dell'analisi ho notato che le portate (flow) delle tubazioni a valle della pompa spenta non tendono mai a 0 ho pensato: per risolvere…
  • modeling a pump start-up transient event in hammer (need help)

    I have an in-line pumping system and I wanted to simulate the pump start-up , I set the problem as in the various examples present in the comunity, but the result of the analysis is "wave speed must be greater than zero". What could be the problem?…
  • Determining the occurrence time for max and min transient pressure at all nodes

    I have carried out transient simulation for an irrigation network. Based on client requirement, I want the occurrence time of the maximum and minimum transient pressures at all junctions. How can we extract this information that at what instant/time we…
  • Como superar o mejorar las presiones negativas en las " presión extrema cabezales"(extreme pressure and heads)

    Hola, tengo presiones negativas en las "presión extrema cabezales"(extreme pressure and heads),el sistema es un modelamiento transitorio en HAMMER(adjunto archivo) Ademas me sale este mensaje 44845 "Con tanque unidireccional" "Pipe" "209" "LINEA…
  • Career Opportunity At Aqua America, Bryn Mawr, PA - Project Engineer - Hydraulic Modeling

    Please apply online and feel free to pass this message along to anyone who may have the interest. Thank you!! https://aquaamerica.wd5.myworkdayjobs.com/en-US/Aqua_America_Careers/job/PA-Bryn-Mawr/Project-Engineer-I_R672-1 GENERAL FUNCTIONS: Build…
  • Transient pressure graph in an interior node of the pipe

    Hi, How can I draw a transient pressure graph (pressure data against time) in an interior node of a pipe? Thanks
  • Error: Initial flow is zero, which would result in a discharge coefficient equal to 0, which is not allowed

    Good Afternoon: I am trying to model an irrigation net with a pump, reservoir an irrigation net where all are connected. My particular situation to model is: No demand in any hydrant Pump working from the river to the reservoir Pump shot down…
  • area change modeling

    Hello, how could I model area change in bentley hammer ? Is there any method rather than splitting pipe? does pipe splitting do better simulation for Wave Reflection and Transmission at an expansion and a contraction?
  • Gas volume in hydro-pneumatic tank

    Hello forum, I'm having doubt (due to client "inquiries"), therefore I'm addressing this question to you all. I'm using sealed, gas-law model, hydropneumatic tank element, to model the surge vessel. Total volume is 200m3 and initial gas volume is…
  • Getting reliable results from Bentley Hammer

    Hi, I am modelling a simple system to compare the results to some codes that I have. But, despite having all the configurations similar to codes, I cannot get similar pressure fluctuation. Could you please have a look and let me know the reason? …
  • Modeling Reference - Surge Tanks

    Product(s): HAMMER Version(s): CONNECT Edition, V8i Area: Modeling Overview This tech-note discusses how to configure the Surge Tank element for transient analysis in HAMMER. Background A Surge Tank (also known as a …
  • Negative pressures occur during a transient simulation no matter what protection is used

    Applies To Product(s): HAMMER Version(s): V8i, CONNECT Edition Area: Modeling Original Author: Jesse Dringoli, Bentley Technical Support Group Problem When computing a transient simulation…
  • Modeling demand patterns (change in outflow) during a transient simulation in HAMMER

    Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Area: Modeling Original Author: Scott Kampa, Bentley Technical Support Group How To How to model demand patterns in Bentley HAMMER…
  • Easily reuse WaterCAD and WaterGEMS models for a transient analysis in HAMMER

    Have you ever wanted to perform a transient analysis on a water network that you've designed? Did you know that you can configure the transient analysis while you design the steady state/EPS water model in WaterCAD or WaterGEMS, then directly open the…
  • What can cause a transient wave to dampen?

    Product(s): Bentley HAMMER Version(s): 08.11.XX.XX Environment: N\A Area: Calculations Problem What causes transient waves to dampen? According to the Help and the Advanced Water Distribution Modeling…
  • Converting a PRV PSV or FCV to a Throttle Control Valve (TCV) in HAMMER

    Applies To Product(s): HAMMER Version(s): V8i, CONNECT Edition Area: Modeling Original Author: Scott Kampa, Bentley Technical Support Group Overview This TechNote will describe steps to model…
  • What's new in HAMMER V8i SELECTseries 2?

    Product(s): HAMMER Version(s): V8i SELECTseries 2 (08.11.02.31) Area: N/A Overview The SELECTseries 2 release of HAMMER V8i includes many new features and improvements. This technote explores each change. - Support for…
  • Re: Getting ViewContext from IViewManager

    Arpan: output->DrawPointString3d (jmdlEmbeddedDPoint3dArray_getCount(pMyArray), jmdlEmbeddedDPoint3dArray_getPtr(pMyArray, 0), NULL, NULL); That line does exactly what you expect: it draws some points to the view. However, your computer…
  • Re: mdlTransient_free( pTransient, FALSE );

    Native Code Saris said: I still use native code because application . Bentley Systems use the term native code to describe C/C++ source code that is compiled using a C or C++ compiler rather than the MDL compiler ( bcomp.exe ). With…
  • Modeling Reference - Discharge To Atmosphere

    Product(s): HAMMER Version(s): CONNECT Edition, V8i Area: Modeling Overview This TechNote explains how the Discharge to Atmosphere (D2A) element works and its typical application in transient simulations in HAMMER. The example…
  • Modeling Reference - Valve Closure

    Applies To Product(s): HAMMER, WaterGEMS, WaterCAD Version(s): V8i, CONNECT Edition Area: Modeling Original Author: Jesse Dringoli, Bentley Technical Support Group Overview This technote explains…