Q. After temperature dependent properties in my model, I get the following error message. What does it mean?
Fatal bounds error detected
---------------------------
Variable: AirVarProps.Specific Heat Capacity at Constant Pressure
Locale : Domain 1
+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+
Fatal bounds error detected
---------------------------
Variable: AirVarProps.Specific Heat Capacity at Constant Pressure
Locale : Domain 1
+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The CFX-5 solver exited with return code 1. No results file has |
| been created. |
+--------------------------------------------------------------------+
End of solution stage.
Q. Although the error message is referring to a "bounds error", it is really telling you that it has calculated an impossible value for that property. Most likely, this means that the value is negative, a fatal error for properties such as density, viscosity, thermal conductivity, and specific heat capacity.
If you have written an expression, go to the expression editor and plot it to be sure no values are negative over the expected temperature range.
Also, keep in mind that CFX generates a table from the input expression, and that the default range of the table is 100K to 3000K for temperature. Plot the expression for this range and if any values become unreasonable, either change the expression or change the range to be in line with expected results. Often times the range of temperatures expected in the problem will be far less than the default table rang
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Q. After temperature dependent properties in my model, I get the following error message. What does it mean? Fatal bounds error detected --------------------------- Variable: AirVarProps.Specific Heat Capacity at Constant Pressure Locale : Domain 1 +--------------------------------------------------------------------+ | Writing crash recovery file | +--------------------------------------------------------------------+ Fatal bounds error detected --------------------------- Variable: AirVarProps.Specific Heat Capacity at Constant Pressure Locale : Domain 1 +--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The CFX-5 solver exited with return code 1. No results file has | | been created. | +--------------------------------------------------------------------+ End of solution stage. Q. Although the error message is referring to a "bounds error", it is really telling you that it has calculated an impossible value for that property. Most likely, this means that the value is negative, a fatal error for properties such as density, viscosity, thermal conductivity, and specific heat capacity. If you have written an expression, go to the expression editor and plot it to be sure no values are negative over the expected temperature range. Also, keep in mind that CFX generates a table from the input expression, and that the default range of the table is 100K to 3000K for temperature. Plot the expression for this range and if any values become unreasonable, either change the expression or change the range to be in line with expected results. Often times the range of temperatures expected in the problem will be far less than the default table range. |
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