ESDU 75028: Drag due to grooves in a flat plate with turbulent boundary layer, at subsonic and supersonic speeds
Input
  • Section 8 example, part A
  • Section 8 example, part B
  • DEBUG code
  • - Test case, ex A at 45 deg
  • Set as m and mm
  • Set as ft and in
Groove geometry definitions
Groove geometry definitions
Groove geometry definitions
Groove geometry definitions
Summary

ESDU 75028 is derived from a correlation of experimental data that enable the drag increment to be predicted due to a groove of planform aspect ratio greater than 8 normal to the flow. For grooves inclined at angles to the flow exceeding 60 degrees the data for the grooves normal to the flow apply, while for grooves inclined between 0 degrees (parallel to the flow) and 60 degrees a method for obtaining the maximum increment is suggested based on the use of ESDU 75031 to predict the increments due to the forward- and rearward-facing steps together with an appropriate skin friction allowance.

ESDU 73017 and 77021 provide atmospheric data, if required. These Items are complemented by a Toolbox App.

ESDU 68020 provides data for a turbulent boundary layer on a flat plate, if required. Estimates for local and mean skin friction coefficients may be obtained from the Toolbox App.

General
Flow conditions at edge of boundary layer
Groove Excrescence
Surface
Results : Warning - the input has changed! Rerun the calculation contain errors or warnings
Save results as
Partial results are given below.

General

{{tba.ep.o.esducalc.outputdata.CD.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.CD.value, 6)}}
{{tba.ep.o.esducalc.outputdata.planform_area.title}}, {{occ.oodleCore.utils.valPrintFormatted(tba.ep.o.esducalc.outputdata.planform_area.value)}}
{{tba.ep.o.esducalc.outputdata.Rh.title}}, {{occ.oodleCore.utils.valPrint(tba.ep.o.esducalc.outputdata.Rh.value)}}
{{tba.ep.o.esducalc.outputdata.l_over_h.title}}, {{occ.oodleCore.utils.valPrint(tba.ep.o.esducalc.outputdata.l_over_h.value)}}

Results for groove aligned with flow (β = 0)

Groove forward end:
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.forward.P.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.forward.P.value, 4)}}
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.forward.Q.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.forward.Q.value, 4)}}
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.forward.Cd.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.forward.Cd.value, 6)}}
Groove aft end:
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.aft.P.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.aft.P.value, 4)}}
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.aft.Q.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.aft.Q.value, 4)}}
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.aft.Cd.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.ends.aft.Cd.value, 6)}}
Groove sidewalls:
, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.groove.CDSF.value, 6)}}
Groove forward end, aft end and sidewalls:
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.groove.CD0.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.aligned_with_flow.groove.CD0.value, 6)}}
{{tba.ep.o.esducalc.outputdata.aligned_with_flow.groove.F.title}}, {{occ.oodleCore.utils.valPrint(tba.ep.o.esducalc.outputdata.aligned_with_flow.groove.F.value)}}

Results for groove normal to flow (β = 90°)

{{tba.ep.o.esducalc.outputdata.normal_to_flow.Phi.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.normal_to_flow.Phi.value, 4)}}
{{tba.ep.o.esducalc.outputdata.normal_to_flow.Psi.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.normal_to_flow.Psi.value, 4)}}
{{tba.ep.o.esducalc.outputdata.normal_to_flow.Cda.title}}, {{occ.oodleCore.utils.valPrintFixed(tba.ep.o.esducalc.outputdata.normal_to_flow.Cda.value, 6)}}
DEBUG
tba: 
{{tba | json}}

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