Preconditioned conjugate gradient (PCG)

Table of Contents

• Properties
• Usage
• Details
  • Operation
  • Computation cost
• Further information

Properties

• symmetric matrices
• run-time selectable preconditioner
• good parallel scaling

Usage

solver          PCG;
preconditioner  <conditioner>;
relTol          <relative tolerance>;
tolerance       <tolerance>;

Details

Operation

Computation cost

Start-up:

• 1 matrix-vector multiply
• 1 parallel reduction

Per iteration

• 1 matrix-vector multiply
• 3 parallel reductions
• + preconditioner - applied 1x

Further information

Source code

• Foam::PCG

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