Heat sink and method of manufacturing same, heat exchanger, and gyroid structure component and method of manufacturing same

A heat sink assembly, comprising:

• a first heat sink and a second heat sink stacked together;
• and
• a heat source disposed between the first heat sink and the second heat sink, wherein the first heat sink comprises:
• a channel including a gyroid structure;
• a fluid supply port;
• and
• a fluid discharge port,
• a fluid flows from upstream to downstream of the first heat sink,
• the gyroid structure includes a wall having a non-uniform thickness, and
• a first thickness of the wall at a downstream position is thicker than a second thickness of the wall at an upstream position.