This　paper　presents　an　investigation　on　the　cooling　performance　in　a　ribbed　channel　with　the　pulsating　inlet　flow.　The　flow　structures　and　heat　transfer　characteristics　are　simulated　by　solving　the　three-dimensional　Unsteady　Reynolds-Averaged　Navier-Stokes　equations　(U-RANS)　and　the　Shear　Stress　Transport　(SST)　turbulence　model　coupled　with　the　γ-Reθ　transition.　The　influence　of　pulsating　parameters　in　terms　of　pulsating　amplitudes　and　frequencies　on　the　cooling　performance　are　evaluated　at　the　Reynold　number　of　10000.　The　results　obtained　show　that　the　coolant　velocity　variation　corresponds　to　the　inlet　velocity　variation,　almost　the　sinusoidal　curve　shape.　The　heat　transfer　performance　influenced　by　the　turbulence　intensity　is　also　the　sinusoidal　curve　shape　and　increases　with　increasing　pulsating　amplitudes　and　frequencies.　The　pressure　loss　penalty　related　to　the　flow　characteristics　is　also　the　sinusoidal　curve　shape　while　the　thermal　performance　indexes　at　four　time　frames　(1T/4,　2T/4,　3T/4　and　4T/4)　show　the　90-degree　phase　difference　with　the　sinusoidal　curve.　Additionally,　the　thermal　performance　increases　with　increasing　pulsating　amplitudes　and　frequencies.　©　2020