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Residuals in a Transient valve analysis.

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Old   June 13, 2016, 11:05
Default Residuals in a Transient valve analysis.
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Hi there,

I am running a transient simulation for flow through a valve. I have the timesteps set to 1e-05s for 100 timesteps which I hope should give me a reasonable solution. However, I am at a slight loss as to whether the results look right or not.

Attached are two images, the first has the residual drop for against iterations for a selection of timesteps. The second shows the outputs of a selection of monitoring points. (Please excuse the slightly pixelated image, a quick paint hash job was necessary to get the images uploaded).

Transient Residuals 1.jpg

Transient Residuals 2.jpg

Transient Outputs.jpg


Is the fact that the residuals seem to be going unstable over time necessarily a bad thing in a transient solution? The monitoring points seem (simulation is still running at this point) to be converging on reasonable values.

Any input would be much appreciated.

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