[ade10]

(IT) Ciao a tutti,
ho un problema con un caso di combustione... in pratica volevo fare prima una specie di "coldflow" con il reactingflow e poi accenderlo assegnando a delle celle (conil setFieldDict) delle temperature elevate (simulando l'ignition) ma non funziona...
voi solitamente come fate?

(EN) Hi to Everyone,
I have a problem with a combustion case... basically I wanted to first do some kind of "coldflow" with reactingflow and then turn it on by assigning high temperatures to cells (with the setFieldDict) (simulating ignition) but it doesn't work...
how do you guys usually do it?

[ztnuaa]

Hi,
It's better if you provide more information of your problem like:
(1) What fuel are you using?
(2) What reaction mechanism are your using, global one step or skeletal/detailed mechanism?
(3) Most importantly, which combustion model do you choose??
Back to your problem, a good start tutorial will be the reatingFoam cases: tutorials/combustion/reactingFoam/RAS/.
DLR_A is a problem with cold flow inlets while the Sandia D flame has pilot flame to ignite the fuel. But in the tutorial they all use EDC model.
When igniting with high temperature, the region should be set carefully.
Timo

[überschwupper]

Maybe this will work for you:


Adding a Source at a predefined time for predefined cells for a predefined duration:



Ignition in combustion

[ade10]

Hi to everyone,

thanks to all to reply me.

finally i resolved my problem with the setFieldsDict. The correction i've done are:
if the box section is:
regions
(
boxToCell
{
box (x1 y1 z1) (x2 y2 z2);
fieldValues
(
volScalarFieldValue T 2500
);
}
);

you must make sure that the box meets these rules:
- x1<x2 , y1<y2, z1<z2
- x1,2; y1,2 and z1,2 must be positive

however if you have any suggestions or examples about the way to set up a box with negative coordinates let me know