|
[Sponsors] |
Old dieselSpray injector types under new lagrangian spray class |
![]() |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
![]() |
![]() |
#1 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 ![]() |
I'm trying to get the same behaviour of the commonRailInjector with the new lagrangian classes (almost repeated the thread title verbatim), and using it under something like sprayFoam. I was curious if the following section in the Properties file had anything to do with injection pressure:
Code:
constantProperties { parcelTypeId 1; rhoMin 1e-15; TMin 200; pMin 1000; minParticleMass 1e-15; rho0 1000; T0 320; Cp0 4187; youngsModulus 1e9; poissonsRatio 0.35; epsilon0 1; f0 0.5; Pr 0.7; Tvap 273; Tbp 373; constantVolume false; } |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 ![]() |
Though I would still like to know the answer to this question, it appears that you can specify the flowType as:
flowRateAndDischarge <-- The default one from the tutorials constantVelocity pressureDrivenVelocity <-- The one I will try and use So that would be enough for me for now, though specifying injection temperature as well would be nice too. |
|
![]() |
![]() |
![]() |
![]() |
#3 |
New Member
arash
Join Date: May 2011
Posts: 11
Rep Power: 15 ![]() |
Hello Marco,
It seems to me that the parameters rho0, Tvap, Tbp, and Cp0 in constantProperties should not be specified by user because all these data are already included for different liquids in /src/thermophysicalModels/properties. In fact, the initial properties can be calculated by using special formulas (e.g. see H2OI.H) whose inputs are just T0 and (gas) pressure at the injection point. So, I don't understand ![]() Any idea? |
|
![]() |
![]() |
![]() |
![]() |
#4 |
Member
Anthony Nitski
Join Date: Aug 2009
Location: Earth
Posts: 35
Rep Power: 17 ![]() |
Hello Marco. Have you been succeed with converting old properties of common rail injector to new spraycloud properties?
|
|
![]() |
![]() |
![]() |
![]() |
#5 | |
New Member
Sandip Wadekar
Join Date: Oct 2014
Posts: 17
Rep Power: 12 ![]() |
Quote:
what's the actual difference between this flowTypes ?? i wonder which one should i use, either flowRateAndDischarge or pressureDrivenVelocity ? Thanks in advance |
||
![]() |
![]() |
![]() |
![]() |
#6 | |
Member
Hosein
Join Date: Nov 2011
Location: Germany
Posts: 94
Rep Power: 15 ![]() |
Quote:
the difference is in how he really calculates U. In flowRateAndDischarge it uses U = V_dot/(A*Cd) and in pressureDrivenVelocity it uses U = sqrt(2*(Pinj - Pamb)/rho). hope this helps... |
||
![]() |
![]() |
![]() |
![]() |
#7 | |
New Member
Sandip Wadekar
Join Date: Oct 2014
Posts: 17
Rep Power: 12 ![]() |
Quote:
that means 1. if i use pressureDrivenVelocity then i don't need to have flow rate profile (I have it from measurements). 2. whats the impact of this two different flowType on liquid penetration length ? I did the simulation with both flowTypes and rest the settings are completely same. results: The penetration with flowRateAndDischarge is very short as compared to pressureDrivenVelocity.... So i confused which one is correct. Thanks in advance! |
||
![]() |
![]() |
![]() |
![]() |
#8 |
New Member
Jiachen Zhai
Join Date: Mar 2019
Posts: 1
Rep Power: 0 ![]() |
if I change the FlowType to be pressureDrivenVelocity, which part should be modified in sprayCloudProperties?
May I have a look at your sprayCloudProperties? |
|
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
thobois class engineTopoChangerMesh error | Peter_600 | OpenFOAM | 4 | August 2, 2014 10:52 |
dieselSpray class and diesel/dieselEngineFoam in OF 2.1.x | mturcios777 | OpenFOAM Running, Solving & CFD | 11 | February 7, 2012 05:03 |
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug | unoder | OpenFOAM Installation | 11 | January 30, 2008 21:30 |
spray injection | mmacrb | FLUENT | 0 | January 10, 2007 05:57 |
About UList and List class | leosding | OpenFOAM Running, Solving & CFD | 1 | December 2, 2005 00:52 |