Initial condition

Initial condition#

Specifies the initial state for the solid heat equation solver.

Available Options#

Option

Description

Constants

Key-value pairs for reusable expressions/constants.

Temperature

Initial temperature value or expression.

See also

For the C-style expression syntax used in initial-condition fields, see the Legacy User Defined Expressions user guide.

Detailed Descriptions#

Constants#

Optional dictionary of key-value pairs to define constants or reusable expressions for the initial condition.

  • Default: None

Notes:

  • Keys are used as variables in expressions (e.g., T0).

  • Values are string expressions or numbers.

  • Useful for parameterizing initial conditions.

Temperature#

Specifies the initial temperature throughout the solid domain. Can be a constant or an expression.

  • Required

  • Example: 300 or T0

Notes:

  • If an expression is used, it may reference constants defined above.

  • The value is treated as non-dimensional unless otherwise specified in the solver setup.

🐍 Python Example Usage

See also

Python API reference: HeatEquationInitialCondition.

Below is a Python code example showing how to define an initial condition for the solid heat equation:

# Example (for reference only, not included in GUI documentation)
initial_condition = fl.HeatEquationInitialCondition(
    temperature="300"
)
# With constants:
initial_condition = fl.HeatEquationInitialCondition(
    constants={"T0": "300"},
    temperature="T0"
)
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