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Old   March 21, 2023, 03:56
Default convergence pb with ddtFoam
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HÚlo´se Magliano
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Hi everyone, I have a problem with the following case :

I try to simulate a rotational detonation combustor with hydrogen combustion. I'm using the ddtFoam solver from OpenFoam.
The computational domain is an annular cylinder surface which i have created with blockMesh and the checkMesh indicates that everything is okay.
I want to inject uniformly stoichiometric H2ľair at 293 K at the inlet. I have part of my domains also that have specific settings of chemicals, pressure and temperture. The result of my setFieldsDict is the image below:


The ignition zone is set with the mixture at high temperature and pressure in order to auto-ignate.
Deflagration is modeled through a reaction progress variable c for each cell (with c 0 representing an unburnt particle and c 1 representing a burnt particle).

At the inlet the pressure should be 1bar and temperature 293K.
My courant number is set to be 0.3 max.

My simulations are crashing but i don't know why: my courant number is increasing and so DeltaT is decreasing to compensate.
Here is the error message i get :

Acoustic Courant Number mean: 9.22991e-05 max: 0.300978
deltaT = 3.65653e-10
Time = 0.00000962374, time step = 275
Quenching 9.57776e-07 % of the turbulent reaction
Calculating Riemann fluxes, second order = true
diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
DICPCG: Solving for Ux, Initial residual = 0.00726394, Final residual = 3.66489e-12, No Iterations 1
DICPCG: Solving for Uy, Initial residual = 0.00455063, Final residual = 2.40089e-12, No Iterations 1
DICPCG: Solving for Uz, Initial residual = 0.00314578, Final residual = 1.56327e-12, No Iterations 1
DICPCG: Solving for fH, Initial residual = 4.19317e-05, Final residual = 1.14321e-11, No Iterations 1
diagonal: Solving for tauHI, Initial residual = 0, Final residual = 0, No Iterations 0
diagonal: Solving for tauLO, Initial residual = 0, Final residual = 0, No Iterations 0
DICPCG: Solving for c, Initial residual = 3.79914e-05, Final residual = 9.35827e-14, No Iterations 1
Combustion progress = 99.13%
diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0
diagonal: Solving for rhoEu, Initial residual = 0, Final residual = 0, No Iterations 0
[7] Maximum number of iterations exceeded
Test = 11198.4 K,
eu_ = 1.20943e+07 J/kg, e(Test,fH) = 1.06602e+07 J/kg
[7] From function eUnburnedThermo::correct(const volScalarField& fH)
[7] in file eUnburnedThermo/eUnburnedThermo.C at line 413.
FOAM parallel run aborting
[7] #0 Foam::error:rintStack(Foam::Ostream&) at ??:?
[7] #1 Foam::error::abort() at ??:?
[7] #2 Foam::eUnburnedThermo::correct() at ??:?
[7] #3
[7] at ??:?
[7] #4 __libc_start_main in "/lib64/"
[7] #5
[7] at ??:?
MPI_ABORT was invoked on rank 7 in communicator MPI_COMM_WORLD
with errorcode 1.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.

My files are attached to this post.
If someone know what my problem could be please ? (maybe with my pressure BC ?)
Helo´seM is offline   Reply With Quote


combustion, compressible, density based, detonation, transonic

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