Input
  • Example from Section 7
  • DEBUG code
  • - Test case 2
  • - Test case 3, British units
  • - Test, as per Section 7 ex, with errors
  • - Test, as per case 2, with warnings
  • Set as m and mm
  • Set as ft and in
Cavity geometry definitions
Cavity definitions
Summary

ESDU 74036 is based on correlations of experimental results obtained on a plate at zero incidence, for predicting the increment in drag for Mach numbers less than 3. The methods apply to a cavity with sharp edges, walls normal to the plate, flat bottom and no through-flow; no information is available on rounding or chamfering of the corners, but such edge modifications should not be assumed to be beneficial. The depth/diameter ratio varied from 0.04 to 1.5 but a method of dealing with a cavity in which the ratio is less than 0.04 and based on the method of ESDU 75031 is presented. The data apply strictly in zero pressure gradient flows, but guidance on their use where there is a pressure gradient is given in the Data Item.

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
Circular Cavity Excrescence
Surface
Results : Warning - the input has changed! Rerun the calculation contain errors or warnings
Save results as
Partial results are given below.

General

For this case $0.04 \le h/d \le 1.5$
{{tba.os.CD.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.CD.value, 5)}}
{{tba.os.planform_area.title}}, {{occ.oodleCore.utils.valPrintFormatted(tba.os.planform_area.value)}}
{{tba.os.results_cavity_diameter.Rd.title}}, {{occ.oodleCore.utils.valPrint(tba.os.results_cavity_diameter.Rd.value)}}
{{tba.os.h_over_d.title}}, {{occ.oodleCore.utils.valPrint(tba.os.h_over_d.value)}}

Intermediate results

{{tba.os.results_cavity_diameter.functions.A.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_diameter.functions.A.value, 5)}}
{{tba.os.results_cavity_diameter.functions.B.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_diameter.functions.B.value, 5)}}
{{tba.os.results_cavity_diameter.functions.F.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_diameter.functions.F.value, 5)}}
{{tba.os.results_cavity_diameter.functions.G.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_diameter.functions.G.value, 5)}}
{{tba.os.results_cavity_diameter.functions.H.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_diameter.functions.H.value, 5)}}

General

For this case $h/d < 0.04$
{{tba.os.CD.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.CD.value, 5)}}
{{tba.os.results_cavity_height.Rh.title}}, {{occ.oodleCore.utils.valPrint(tba.os.results_cavity_height.Rh.value)}}
{{tba.os.h_over_d.title}}, {{occ.oodleCore.utils.valPrint(tba.os.h_over_d.value)}}

Intermediate results

{{tba.os.results_cavity_height.functions.P_aft.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_height.functions.P_aft.value, 5)}}
{{tba.os.results_cavity_height.functions.Q_aft.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_height.functions.Q_aft.value, 5)}}
{{tba.os.results_cavity_height.functions.P_fwd.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_height.functions.P_fwd.value, 5)}}
{{tba.os.results_cavity_height.functions.Q_fwd.title}}, {{occ.oodleCore.utils.valPrintPrecision(tba.os.results_cavity_height.functions.Q_fwd.value, 5)}}
DEBUG
tba: 
{{tba | json}}

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