# Fluent exceeding Solution Limits on faces

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 July 9, 2012, 20:44 Fluent exceeding Solution Limits on faces #1 New Member   Join Date: Jul 2010 Posts: 7 Rep Power: 8 I am using Fluent with a compiled UDF to provide some boundary conditions, specifically a wall heat flux (but the UDF should be irrelevant to this particular issue). I have set the minimum and maximum temperatures in Fluent to 200 K and 2200 K, respectively via the Solution Limits box under Solution Controls. Despite this, when I use the UDF command F_T(face,f_thread) to query the temperature on a boundary face, Fluent often returns a value well outside these temperature limits (including very negative values). Do the Solution Limits specified under Solution Controls not apply to faces? How can I force Fluent to limit ALL temperatures (including faces) to these limits?

 July 10, 2012, 00:20 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,305 Rep Power: 22 Maybe you could use a bounded scheme (like first order upwind) for the computation of the Energy equation.

July 10, 2012, 15:49
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 Originally Posted by flotus1 Maybe you could use a bounded scheme (like first order upwind) for the computation of the Energy equation.
I am already using first order upwind for the energy equation in this case, so that doesn't seem to be the issue.

 July 10, 2012, 16:34 #4 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,305 Rep Power: 22 You are right, with a first order upwind scheme, over- and undershoots should not appear, especially when the range of the variable is set as a limit for the solver. I'd be interested in a solution to this problem too. My current analysis features a melting process in which the liquidus temperature is exceeded before the cell is fully melted.

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