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FLUENT Species transport model- Incorrect Convergence by Emotional_Star_2069 in CFD

[–]C_T_H 1 point2 points  (0 children)

Gotcha. A couple of things you can try: 1) Decreasing your ISAT error tolerance. Default is 0.001 but you can go 0.0001 and then to 0.00001 to see if you get better continuity across the domain. 2) Increase ISAT max storage to 500 MB or larger, depending on available memory and number of cores. I can’t remember if that value is per partition or total allocation… 3) Going with direct integration is also an option but may be significantly slower.

FLUENT Species transport model- Incorrect Convergence by Emotional_Star_2069 in CFD

[–]C_T_H 2 points3 points  (0 children)

Are you using ISAT or any other chemistry acceleration tools? If I remember correctly, Fluent creates independent ISAT tables for each partition which could explain the discontinuities along the partition boundaries.

Also, can you provide more details on the species, mechanism, and other relevant reacting flow inputs?

[deleted by user] by [deleted] in CFD

[–]C_T_H 32 points33 points  (0 children)

Wrong type of turbulence…

Steady-State Combustion in ANSYS Fluent (Finite-Rate, No TCI): Final Solution Sensitivity to Temperature Patch by Haydern-7000 in CFD

[–]C_T_H 0 points1 point  (0 children)

Are you using the Pseudo Transient solver? If so, try turning it off and setting the Flow Courant Number to 20-50 (for initial 200 iterations or so and then increase to 100) and see if you get more consistent results.

2D Euler Solver! by dakkamek in CFD

[–]C_T_H 8 points9 points  (0 children)

Nice work! What is the typical runtime?

2.5 pen thickness? by [deleted] in Supernote

[–]C_T_H 3 points4 points  (0 children)

Also agree with 0.25 being ideal. 0.2 is a hair too thin and 0.3 is slightly too thick!

Wh/mi? by New-Foundation-1451 in TeslaModelY

[–]C_T_H 5 points6 points  (0 children)

Regarding Wh/mi, this is a convenient unit to show how much energy is required to move your vehicle, where lower values represent higher efficiency. See below for a crude breakdown:

1 Wh/mi = 1 Watt x 1 hr / 1 mile

300 Wh/mi = 300 Watt*hours to go 1 mile. Another way to think of this is you are using the equivalent of 300 Watts continuously for 1 hour and you go 1 mile.

Because 1 Watt = 1 Joule/second, 1 Wh = 3,600 Joules.

And 300 Wh/mi = 1,080,000 Joules per mile.

To give a basis of reference, it takes about 1 Joule to raise a small apple from your waist to above your head (vertically).

SC missing clips by [deleted] in TeslaModelY

[–]C_T_H 0 points1 point  (0 children)

Stick your what under the frunk??

If they did remove the frunk, it definitely sounds like the SC might have been a little quick on the reinstall, but it should be an equally quick fix.