No abstract

This report wu prepared «• an account of work sptMored bv the United States Government. Neither the United States nor the United Stales Energy Research and Devel*m«eiii Adminiitratiod. nor #ny oT their emptoyeei. nor any of their contracttrn, gubcantracton, or their employe**, makes any warranty, express or implied, or aiswnes any legal liability or responsibility for the accuracy. campleteneM, or uMfulMtaof any information, apparse.ii, product, or process disclosed, or represents that its use would not infringe privately owned Hunt*.

No abstract

II. Theory of the Truncation Error Cancellation (TEC) Method 2 III. Application oi the TEC Method <• A. Dlffuslonal Truncation Error* for the RICE Equations-4 B. Stabilization of the RICS Equation* 7 IV. Dlffuslonal Units 9 V. tfuaerlcal Exaaples ; 9

A large reduction in drag coefficient has been observed in certain external flows of aqueous solutions with high molecular weight polymer additives. A change in the near wake configuration is phenomenologically responsible for the drag reduction, but the underlying mechanism is presently unknown. An analogy to known phenomena in particulate suspensions is drawn which suggests nonuniform concentration of the polymer additive as an explanation. An analysis of the boundary layer on a sphere with varying viscosity was made to investigate the effect. The results indicate early transition to turbulence for concentration variations whose length scale is small compared with the momentum boundary layer thickness. Stabilization and delayed transition are indicated for thicker concentration layers. Observations are suggested for the thin concentration layers.