THE PROPOSED EFFORT WILL ADDRESS TOPIC "2.3 ADVANCED ICE ACCRETION MODELING STUDIES" OF THE NNH10ZEA001N-AEST1 SOLICITATION. SPECIFICALLY THE PROPOSED EFFORTS WILL ADDRESS THE SUBTOPIC OF "NAVIER-STOKES HEAT TRANSFER METHODS WITH ROUGHNESS EFFECTS." THE ULTIMATE GOAL OF THE EFFORT IS TO IMPLEMENT CORRELATIONS OR ADVANCED NAVIER-STOKES BASED APPROACHES FOR PREDICTING CONVECTIVE HEATTRANSFER FROM REALISTIC ICE ROUGHNESS DISTRIBUTIONS IN CURRENT AND FUTURE ICE ACCRETION PREDICTION CODES. THE PROPOSED EXPERIMENTAL EFFORTS WILL ENABLE AN IMPROVED UNDERSTANDING OF HOW REALISTIC ROUGHNESS DISTRIBUTIONS AFFECT HEAT TRANSFER IN THE FORMATION OF ICE ACCRETIONS IN REALISTIC FLOW AND THERMAL BOUNDARY CONDITIONS. THE EFFORT WILL FOCUS ON USING REALISTIC DISTRIBUTIONS OF ROUGHNESSELEMENTS OBSERVED ON ICE ACCRETIONS VARIATIONS IN THERMAL BOUNDARY CONDITIONS TO REPRESENT HEATED AND UNHEATED WINGS AND BOTH STAGNATION REGION HEAT TRANSFER AND FLAT PLATE FLOWS WITH VARIATIONS IN FREE STREAM ACCELERATION. THE PROPOSED EFFORTS WILL BE PERFORMED IN THE BAYLOR SUBSONIC WIND TUNNEL AND IN THE NASA VERTICAL ICING STUDIES TUNNEL (VIST). AN APPARATUS FOR MEASURING CONVECTIVE ENHANCEMENT OF FLOWS OVER ROUGH SURFACES EMPLOYING VARIOUS THERMAL BOUNDARY CONDITIONS HAS BEEN DEVELOPED AND VALIDATED IN THEBAYLOR SUBSONIC WIND TUNNEL. A SIMILAR CONVECTION MEASUREMENT SYSTEM WILL BE CONSTRUCTED FOR THE VIST. ADVANCED CORRELATIONS WILL BE DEVELOPED BASED ON THE MEASUREMENTS THAT INCLUDE THE FLOW ACCELERATION PARAMETER THE THERMAL BOUNDARY LAYER THICKNESS AND A PARAMETER TO DESCRIBE GENERALIZED THERMAL BOUNDARY CONDITIONS IN ADDITION TO THE PARAMETERS THAT APPEAR IN TRADITIONAL CORRELATIONS FOR PREDICTING CONVECTION FROM ROUGH SURFACES. IN ADDITION TO THE DEVELOPED CORRELATIONS THE DATA ACQUIRED THROUGH THE PROPOSED EXPERIMENTAL EFFORT WILL BE CRUCIAL FOR THE FUTURE DEVELOPMENT AND VALIDATION OF DISCRETE-ELEMENT OR NAVIER-STOKES MODELING APPROACHES.