July 20, 2020 at 4:48 pmveeraSubscriber
i am simulating the In-cylinder (ic engine simulation) , with dynamic mesh (hybrid mesh), with DPM (diesel liquid), and species (diesel-air)
i am using k-e rng -eddy dissipation with volumetric.
initial conditions: chamber pressure 70bar and 713k
DPM injection from the surface with 183 m/s for the crank angle of 337-350 - in boundary condition i kept that surface as the wall with escape
i am facing following errors
1. invalid cp (1.000000+00) for species (ex:nitrogen, diesel-air) zero (k)nan
2.turbulent viscosity limited to viscosity ratio of 1.000000e+5 for cell xxx (near half the total cell)
3.divergence detected in AMG solver: temperature
4. Temperature limited to 1.0000e+5in xxx cellson zone domain xx
July 21, 2020 at 3:19 pmRobAnsys Employee
Try with constant material properties for cp, k etc and see how it behaves. Have you got the mesh working yet?
July 21, 2020 at 4:53 pmveeraSubscriber
no sir, it's not happening, in layer sets, I tried the height with split factor1 also, but it's not happening.
pls try to give answers for above all the questions
questions 2, 3, 4
July 21, 2020 at 6:06 pmveeraSubscriber
hi sir, i run with a constant value, see initially i am started the problem with invalid cp in n2 , if i modify range in material parameters , after few itteration its showes invalid cp in diesel-air mixture
this are my mixtures
suppose, i switch off species and DPM model, the dynamic mesh is working properly with solution converged
pls help me to resolve this problem
July 22, 2020 at 10:27 amRobAnsys Employee
4 will cause 1 and which likely triggers 3. 2 may be related to 4 but may also be boundary condition or settings related.
If the mesh runs OK try it with single phase, does it work, and is the mesh skew good enough?
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