[charlescfd]

Hi,

I have been trying to run a simulation on a geometry using the InterFoam solver. after an hour or so, the delta T value gradually reaches to low values in the range of 1e-100 from 1e-05 and simulation crashes. I have been trying to fix this problem for a long time, but is unsuccessful till date.
I am adding my controlDict and my checkMesh results along with this message. Any help will be appreciated.
Thank you in advance

ControlDict

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.x                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application     interFoam;

startFrom       latestTime;

startTime       0;

stopAt          endTime;

endTime         0.1; 

deltaT		1e-5;//5e-5;

writeControl    adjustableRunTime;  

writeInterval   1e-4;

purgeWrite      0;

writeFormat     ascii;

writePrecision  6;

writeCompression uncompressed;

timeFormat      general;

timePrecision   8;

runTimeModifiable yes;

adjustTimeStep  yes;

maxCo           1;

maxAlphaCo      1;

maxDeltaT       1e-5; 

// ************************************************************************* //

CheckMesh

/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5.x |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 5.x-197d9d3bf20a
Exec : checkMesh
Date : Aug 06 2018
Time : 20:59:56
Host : "*********"
PID : 7919
I/O : uncollated
Case : ************************************
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
points: 22811
faces: 62700
internal faces: 57300
cells: 20000
faces per cell: 6
boundary patches: 8
point zones: 0
face zones: 0
cell zones: 0

Overall number of cells of each type:
hexahedra: 20000
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 0

Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
left 900 971 ok (non-closed singly connected)
inlet_oil 200 231 ok (non-closed singly connected)
down 1100 1191 ok (non-closed singly connected)
up 400 451 ok (non-closed singly connected)
inlet_water 300 331 ok (non-closed singly connected)
outlet 500 541 ok (non-closed singly connected)
frontAndBack 1600 1732 ok (non-closed singly connected)
capillaryWalls 400 462 ok (non-closed singly connected)

Checking geometry...
Overall domain bounding box (0 0 -0.00215) (0.00765 0.0011 0.002)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (-3.17589e-16 -1.19329e-15 4.17605e-16) OK.
Max cell openness = 2.25477e-16 OK.
Max aspect ratio = 72.7628 OK.
Minimum face area = 7.62463e-11. Maximum face area = 3.12396e-08. Face area magnitudes OK.
Min volume = 3.81232e-15. Max volume = 1.56198e-12. Total volume = 6.26804e-09. Cell volumes OK.
Mesh non-orthogonality Max: 73.2218 average: 14.5284
*Number of severely non-orthogonal (> 70 degrees) faces: 60.
Non-orthogonality check OK.
<<Writing 60 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 0.885518 OK.
Coupled point location match (average 0) OK.

Mesh OK.

End

[VadymOstanin]

I faced the same issue.
Found solution to change "adjustTimeStep yes;" to "adjustTimeStep no;"