[tag] d2value

Second-derivative expressions w.r.t. an unordered pair of variables. Each entry stores the VariablePair - where (v1, v2) and (v2, v1) are treated as identical - together with multi-component expressions corresponding one-to-one with the value expressions. Specified in the project file as:

<d2value>
  <variable_name>temperature</variable_name>
  <variable_name>phase_pressure</variable_name>
  <expression>d2f1/dT dp</expression>
  <expression>d2f2/dT dp</expression>
</d2value>

Child parameters, attributes and cases

• [tag] expression
• [tag] variable_name

Additional info

From MaterialLib/MPL/Properties/CreateFunction.cpp line 73

• This parameter can be given arbitrarily many times.
• Expanded tag path: NONEXISTENT.property.Function.d2value
• Go to source code: → ogs/ogs/6.5.9

Used in the following test data files

Used in no end-to-end test cases.