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Problem diverges when exhaust valve opens

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Old   September 21, 2018, 07:14
Default Problem diverges when exhaust valve opens
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Stephan Werner
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Hello everyone,
I'm using Fame Engine Plus to simulate a 4 valve gasoline engine. The meshing works fine, but the solver diverges right when the exhaust valves open. Could anybody help me please with where I'ld have to look for the error?
The logfile provides the following information:





Quote:
************************************************** **************************
* 670. Time Step Time = 0.1545454545E-01 dt = 0.3030E-04 *
* Angle = 870.000 dphi = 0.1000E+01 *
************************************************** **************************

ITER I**************** Relative Residual Source Sums *************I I******* Field Values at Monitoring Location 1 *******I

NO. RESU RESV RESW RESM RESK RESD RESH U V W P TKIN DISP TEMP
1 1.00E+00 1.00E+00 1.00E+00 1.00E+00 1.00E+00 1.00E+00 1.00E+00 3.63E-01-4.02E-01 8.79E-01 4.38E+04 1.90E+00 7.13E+02 1.19E+03
2 6.73E+00 6.25E+00 5.94E+00 1.26E-01 1.09E+00 6.15E+00 1.55E+00 -1.70E+00-1.93E+00 2.80E+00 3.98E+04 1.95E+00 7.33E+02 1.20E+03
3 4.89E+00 3.97E+00 3.79E+00 4.35E-01 4.98E-01 3.60E-01 1.06E+01 -1.20E+00-1.29E+00 1.91E+00 3.99E+04 1.95E+00 7.31E+02 1.20E+03
4 1.64E+00 1.74E+00 1.40E+00 6.45E-01 3.12E-01 6.58E-01 1.36E+00 -8.39E-01-1.13E+00 1.86E+00 3.99E+04 1.95E+00 7.33E+02 1.20E+03
5 8.02E+00 6.53E+00 5.91E+00 3.63E-01 8.43E-01 6.62E+01 2.28E+01 -6.29E-01-1.04E+00 1.82E+00 3.99E+04 1.96E+00 7.33E+02 1.20E+03
6 1.85E+01 1.44E+01 1.41E+01 2.09E+02 1.19E+00 3.67E+02 3.86E+02 -6.03E-01-1.03E+00 1.80E+00 3.99E+04 1.96E+00 7.33E+02 1.20E+03
7 1.21E+01 2.52E+01 7.39E+00 3.10E+08 1.21E+00 1.47E+06 3.86E+02 -5.75E-01-1.02E+00 1.79E+00 3.99E+04 1.96E+00 7.33E+02 1.20E+03
8 1.76E+01 8.60E+00 1.36E+01 2.72E+21 1.21E+00 2.60E+06 4.77E+02 -5.72E-01-1.02E+00 1.80E+00 3.99E+04 8.49E+00 7.33E+02 5.00E+03
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
Problem diverges: Scalar/Species transport equation, variable: Scalar/Species, material: 1
9 9.91E+00 3.29E+00 2.16E+01 2.32E+50 6.89E-01 2.60E+06 2.23E+02 1.63E+04 2.83E+05-1.52E+05 7.18E+05 6.33E+26 9.80E+48 5.00E+03
Problem diverges with flb value: residual M, location: 1, material: 1
Problem diverges with flb value: ED, location: 1, material: 1
%fire-I-CMAIN, CALCULATION DIVERGED.

PS I would upload the whole file, but the upload manager declines it, probably too big with nearly 30 MB
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