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Search took 0.00 seconds. Search: Posts Made By: Bob Tipton
Forum: Main CFD Forum October 5, 2020, 00:12
Replies: 14
Views: 2,308
Posted By Bob Tipton
Here's a second pic of the pressure distribution....

Here's a second pic of the pressure distribution.
It shows why having a very large volume to the side is required.
Forum: Main CFD Forum October 5, 2020, 00:06
Replies: 14
Views: 2,308
Posted By Bob Tipton
Cd of solid hemisphere

My goal was to get an error < 0.5%. I'm trying to find out how high a Cd is possible from a real structure and some of my early figures were not credible. So I went back to 'calibrate' the analysis...
Forum: Main CFD Forum October 4, 2020, 23:37
Replies: 14
Views: 2,308
Posted By Bob Tipton
One other item. The minimum pressure isn't...

One other item.
The minimum pressure isn't achieved until the trailing vortex stabilizes. Since there is virtually zero mixing in the trailing vortex and all of the energy must be transferred by...
Forum: Main CFD Forum October 4, 2020, 23:25
Replies: 14
Views: 2,308
Posted By Bob Tipton
SimFlow reports - RNG k-ε - RAS It's an...

SimFlow reports - RNG k-ε - RAS
It's an option in their UI.
I've got 40+ years in fluid dynamics, but only 6 months using the new CFD tools.
I did experiments with other methods and didn't...
Forum: Main CFD Forum October 4, 2020, 02:53
Replies: 14
Views: 2,308
Posted By Bob Tipton
Accurate lift and drag

After lots of experimenting with boundary conditions, meshing and relaxation - I was able to reproduce the measured reference Cd of a solid hemisphere to within 0.020%.

It's not easy.

Key to a...
Forum: Main CFD Forum September 26, 2020, 01:25
Replies: 14
Views: 2,308
Posted By Bob Tipton
Yes. The kinematic viscosity is about 15x...

Yes.

The kinematic viscosity is about 15x higher for air and that would have a larger damping effect.

I did some experiments with doing my trade studies in air to speed things along - but...
Forum: Main CFD Forum September 24, 2020, 18:39
Replies: 14
Views: 2,308
Posted By Bob Tipton
I have been doing similar work on drag for that 6...

I have been doing similar work on drag for that 6 months. In my case I am in the very high drag/low RN regime in H20 but some of what I have been finding may be helpful.

The distance to the...
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