[minecraftgp]

Hi

I was running a case with tracer injection at a specific time step (10s) in a room with "funkySetFields -time 10". But the tracer still injected at the begining of the modelling (0s). Anyone can help?

Cheers

[minecraftgp]

My funkySetFieldsDict like this

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  plus                                  |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      funkySetFieldsDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


 expressions
 (
	contaminant1
	{
		field tracer;
		expression "100"; 
		condition  "set(contaminant1)";
        }
	contaminant2
    	{
		field tracer;
		expression "100";
		condition  "set(contaminant2)"; 
	}
	contaminant3
	{
		field tracer;
		expression "100"; 
		condition  "set(contaminant3)";
	}
	contaminant4
	{
		field tracer;
		expression "100";
		condition  "set(contaminant4)"; 
	}
	contaminant5
	{
		field tracer;
		expression "100";
		condition  "set(contaminant5)"; 
	}
 );
// ************************************************************************* //

[minecraftgp]

And my running log like this, whatever timestep I used, the funkySetFields always starts from 0s

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1712                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v1712
Arch   : "LSB;label=32;scalar=64"
Exec   : funkySetFields -time 0.1
Date   : Aug 12 2019
Time   : 17:58:09
Host   : "minecraftgp-HP-EliteDesk-800-G3-TWR"
PID    : 1570
I/O    : uncollated
Case   : /home/minecraftgp/openFoam_case/6.3closedFillingBox/6.3.1singlePlumeTracerPosition/bbpf_sp_bl_t28800
nProcs : 1
trapFpe: Floating point exception trapping enabled (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
swakVersion: 0.4.2 (Release date: 2018-12-29)
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0


Time = 0
 Using funkySetFieldsDict 



Part: contaminant1
 Modifying field tracer of type volScalarField

 Putting "100" into field tracer at t = "0" if condition "set(contaminant1)" is true

No set contaminant1 at t=0 falling back to 'constant'
 Setting 8 of 103200 cells
 Writing to "tracer"

[gschaider]

Originally Posted by minecraftgp

And my running log like this, whatever timestep I used, the funkySetFields always starts from 0s

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1712                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v1712
Arch   : "LSB;label=32;scalar=64"
Exec   : funkySetFields -time 0.1
Date   : Aug 12 2019
Time   : 17:58:09
Host   : "minecraftgp-HP-EliteDesk-800-G3-TWR"
PID    : 1570
I/O    : uncollated
Case   : /home/minecraftgp/openFoam_case/6.3closedFillingBox/6.3.1singlePlumeTracerPosition/bbpf_sp_bl_t28800
nProcs : 1
trapFpe: Floating point exception trapping enabled (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
swakVersion: 0.4.2 (Release date: 2018-12-29)
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0


Time = 0
 Using funkySetFieldsDict 



Part: contaminant1
 Modifying field tracer of type volScalarField

 Putting "100" into field tracer at t = "0" if condition "set(contaminant1)" is true

No set contaminant1 at t=0 falling back to 'constant'
 Setting 8 of 103200 cells
 Writing to "tracer"

You said above that you want to set it at t=10 but your command line option is t=0.1



I'm not quite sure what you want to accomplish. But you've got to be aware: if you set the field at t=10 and the solver starts at t=0 then it will read the t=0 variant and ignore t=10

[minecraftgp]

Originally Posted by gschaider

You said above that you want to set it at t=10 but your command line option is t=0.1



I'm not quite sure what you want to accomplish. But you've got to be aware: if you set the field at t=10 and the solver starts at t=0 then it will read the t=0 variant and ignore t=10

Thank you for reply Bernhard, t=0.1 was another attempt but it started from t=0 as well.

I dont think I understand how '-time' utility works. For now I set the startTime=0 in controldict. From my understanding the solver should start at t= 0, and then a new field value will be set (or changed) at t=10 by funkySetFields.

By that do you mean I should set the startTime=10s as well?

[gschaider]

Originally Posted by minecraftgp

Thank you for reply Bernhard, t=0.1 was another attempt but it started from t=0 as well.

I dont think I understand how '-time' utility works. For now I set the startTime=0 in controldict. From my understanding the solver should start at t= 0, and then a new field value will be set (or changed) at t=10 by funkySetFields.

By that do you mean I should set the startTime=10s as well?

FSF is a pure post/preprocessing utility. Which means: you specify a time t=10. It evaluates the expression using the fields it finds in the 10-directory and writes the result there as well


The solver on the other hand reads all it needs to know from the startTime (usually 0) and then runs. It ignores the content of everything else. So whatever is in the 10-directory is ignored (or overwritten)


If you want to "switch on" the tracer at t=10 you'll need a functionObject or a fvOption