Time schemes

Table of Contents

• Usage
• Options
• Example
• Further information

Time schemes define how a property is integrated as a function of time, i.e.

\[ \ddt{\phi} \]

Depending on the choice of scheme, field values at previous time steps are required, represented in the following as \( \old{\phi} \) and \( \oldold{\phi} \) for the old and old-old time levels.

Usage

Time scheme properties are input in the fvSchemes file under the ddtSchemes sub-dictionary using the syntax:

ddtSchemes
{
    default         none;
    ddt(Q)          <time scheme>;
}

Options

Available time schemes include

• Backward time scheme
• Crank-Nicolson time scheme
• Euler implicit time scheme
• Local Euler implicit/explicit time scheme
• Steady state time scheme

Example

See this example to see the relative performance of the schemes.

Further information

Source code:

• Foam::fv::ddtScheme

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