In　this　paper,　the　effect　of　longitudinal　vortex　generators　(LVGs)　on　the　performance　of　a　thermoelectric　power　generator　(TEG)　with　a　plate-fin　heat　exchanger　is　investigated.　A　fluid-thermal-electric　multi　physics　coupled　model　for　the　TEG　is　established　on　the　COMSOL　(R)　platform,　in　which　the　Seebeck,　Peltier,　Thomson,　and　Joule　heating　effects　are　taken　into　account.　The　equivalent　thermal-electrical　properties　of　the　thermoelectric　(TE)　module　are　used　in　the　numerical　simulation.　The　results　indicate　that　the　LVGs　produce　complex　three-dimensional　vortices　in　the　cross　section　downstream　from　the　LVGs,　thus　enhancing　the　heat　transfer　and　electric　performance　compared　to　a　TEG　without　LVGs.　Under　baseline　operating　conditions,　the　heat　input　and　open　circuit　voltage　of　the　TEG　with　LVGs　are　increased　by　41-75%　compared　to　a　TEG　with　smooth　channel.　The　simulations　also　show　that　the　Reynolds　number　and　hot-side　inlet　temperature　have　significant　effects　on　the　net　power　and　thermal　efficiency　of　the　TEG,　but　the　cold-side　temperature　has　a　smaller　effect.　Additionally,　the　performance　of　the　TEG　under　a　constant　heat　transfer　coefficient　boundary　condition　is　almost　the　same　as　the　performance　under　a　constant　temperature　boundary　condition.　Overall,　this　work　demonstrates　that　LVGs　have　great　potential　to　enhance　the　performance　of　TEGs　for　waste　heat　recovery　from　vehicle　exhaust.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.