# 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.

# 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.

💡 Tips
  • Use constants to simplify complex or repeated expressions.
  • For uniform initial temperature, enter a single value (e.g., 300).

❓ Frequently Asked Questions

  • What happens if I leave Temperature blank?

    The form will not submit and will prompt you to provide a value.

  • Can I use variables in the Temperature field?

    Yes, if you define them in the Constants section.

🐍 Python Example Usage

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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