Numerical　simulation　of　turbulent　flow　with　re-circulation　was　conducted　by　SIMPLE　algorithm　with　two-equation　k-ε　model.　Extension　of　computational　region　method　and　wall　function　method　were　quoted　to　regulate　the　whole　computational　region　geometrically,　given　the　inlet　Reynold　number　keeps　10000,　by　changing　the　height　of　the　solid　obstacle.　The　result　showed　that　the　overall　wall　heat　flux　and　heat　exchange　Nu　increased　with　the　decrease　of　the　angle　between　the　velocity　vector　and　the　temperature　gradient.　It　verified　that　the　field　synergy　principle　based　on　2-D　boundary　laminar　flow　may　be　applied　to　complex　turbulent　flow　even　with　re-circulation.