CMPS solver validation

Validation against analytical and experimental references

Each case gives the test definition, boundary-condition configuration, mesh size, validation basis, result summary and the related plots or solution field.

Comparison policy. Ansys Fluent, CFX, SU2 and other CFD solutions are not used as validation references. Where the report originally contained several numerical curves, the displayed figure retains the CMPS and analytical or experimental evidence. The report does not tabulate every numerical boundary value, so the entries below state the boundary types and physical configuration.
Analytical and exact

Fundamental flow and heat-transfer cases

Conservation, compressible-flow and solid-conduction benchmarks.

No Flux Test Case

A closed uniform-flow problem used to verify that the discretization does not generate a solution when every boundary flux is zero.

Boundary conditions

Zero normal mass, momentum and energy flux on the external boundaries; uniform initial state.

Mesh

500 cells

Validation basis

The exact solution is the unchanged initial field.

Result

The density remains 1.0 across the domain.

No Flux Test Case density profile and field
Density profile and density field. Select to enlarge.

Axisymmetric Shock Tube Test Case

An axisymmetric shock-tube problem containing an expansion wave, contact discontinuity and shock.

Boundary conditions

Axis condition on the centreline; two initial states separated by a diaphragm discontinuity; transient shock-tube end boundaries.

Mesh

500 cells

Validation basis

Density, velocity, pressure and internal energy are compared with the reference Riemann solution.

Result

CMPS reproduces the principal wave locations and plateau states.

Axisymmetric Shock Tube reference profiles and density fields
Reference profiles and density fields. Select to enlarge.

Oblique Shock Test Case

Two-dimensional steady supersonic flow over a 15-degree ramp, producing an attached oblique shock.

Boundary conditions

Supersonic inflow; solid ramp wall; supersonic outlet and outer far-field boundary.

Mesh

165,000 cells

Validation basis

Analytical post-shock reference values: temperature 382.0, density 2.277 and Mach 1.874.

Result

CMPS gives 377.7617, 2.2310 and 1.8983 respectively; differences are approximately 1.11%, 2.02% and 1.30%.

Oblique Shock Mach field
Mach-number field over the 15-degree ramp. Select to enlarge.

Normal Shock Test Case

A steady supersonic nozzle flow containing an internal normal shock.

Boundary conditions

Supersonic nozzle inlet; solid nozzle walls; downstream outlet condition selected to sustain an internal normal shock.

Mesh

8,000 cells

Validation basis

The axial Mach-number distribution is compared with the analytical nozzle and normal-shock solution.

Result

CMPS follows the analytical acceleration and the abrupt transition through the shock.

Normal Shock analytical comparison and Mach field
Analytical Mach comparison and Mach field. Select to enlarge.

Isentropic Expansion Test Case

A centred two-dimensional expansion of inviscid supersonic flow around a corner.

Boundary conditions

Supersonic inlet; slip walls forming the expansion corner; supersonic outlet and far-field boundary.

Mesh

8,154 cells

Validation basis

The downstream Mach number is compared with the analytical Prandtl-Meyer value of 3.237.

Result

CMPS gives Mach 3.1896, a difference of approximately 1.46%.

Isentropic Expansion Mach field
Mach-number field through the centred expansion. Select to enlarge.

Solid Conduction (Const T) Test Case

One-dimensional steady heat conduction configured axisymmetrically.

Boundary conditions

Prescribed temperatures at the thermal boundaries; axis condition on the centreline; remaining surfaces insulated or symmetric.

Mesh

500 cells

Validation basis

The temperature distribution is compared with the steady analytical conduction profile.

Result

The computed temperature profile follows the reference linear distribution.

Solid Conduction constant temperature profile and field
Temperature profile and temperature field. Select to enlarge.

Solid Conduction (Const HF) Test Case

One-dimensional steady solid conduction with a constant heat-flux boundary, configured axisymmetrically.

Boundary conditions

Specified wall heat flux; thermal reference condition on the opposite boundary; axis condition on the centreline.

Mesh

500 cells

Validation basis

The temperature distribution is compared with the analytical constant-heat-flux solution.

Result

CMPS reproduces the expected temperature gradient through the solid.

Solid Conduction constant heat flux profile and field
Temperature profile and temperature field. Select to enlarge.
Analytical correlations

Flat-plate validation family

Every row includes its wall condition, mesh and the related validation figure.

Official test name Boundary conditions and mesh Validation result Plots and field
Laminar Flat Plate (Adiabatic) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip adiabatic plate wall.Mesh4,096 cells Skin-friction and velocity profiles follow the laminar analytical correlations. Laminar Flat Plate Adiabatic plots
Laminar Flat Plate (Cons T) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip constant-temperature plate wall.Mesh3,136 cells Skin friction, wall heat flux and velocity follow the reference distributions. Laminar Flat Plate constant temperature plots
Laminar Flat Plate (Cons HF) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip constant-heat-flux plate wall.Mesh3,136 cells Skin friction, thermal wall response and velocity follow the analytical trends. Laminar Flat Plate constant heat flux plots
Turbulent Flat Plate (Adiabatic) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip adiabatic wall; near-wall resolution around y+ = 1.Mesh13,464 cells CMPS captures the reference skin-friction trend and nondimensional near-wall velocity behaviour. Turbulent Flat Plate Adiabatic plots
Turbulent Flat Plate (Const T) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip constant-temperature plate wall.Mesh13,056 cells Skin friction, heat flux and velocity follow the turbulent reference relations. Turbulent Flat Plate constant temperature plots
Turbulent Flat Plate (Const HF) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip constant-heat-flux plate wall.Mesh13,056 cells Skin friction, wall temperature and velocity show the expected aerodynamic and thermal development. Turbulent Flat Plate constant heat flux plots
Turbulent Flat Plate (Adiabatic y+) Test Case Boundary conditionsFreestream inlet and far-field; downstream outlet; no-slip adiabatic wall with several first-cell spacings.Mesh13,464 cells for y+ = 1, 3 and 20; 10,744 cells for y+ = 110 Skin-friction curves show the wall-treatment response across the tested y+ values. Turbulent Flat Plate y plus plots
Laminar Flat Plate (Adiabatic SS) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip adiabatic plate wall.Mesh25,000 cells Skin friction, wall temperature and near-cell temperature follow compressible reference correlations. Supersonic laminar adiabatic flat plate plots
Laminar Flat Plate (ConstT SS) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip constant-temperature plate wall.Mesh25,000 cells Skin friction, heat flux and near-cell temperature track the compressible reference curves. Supersonic laminar constant temperature flat plate plots
Laminar Flat Plate (ConstHF SS) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip constant-heat-flux plate wall.Mesh25,000 cells CMPS follows the reference skin-friction, wall-temperature and near-cell-temperature profiles. Supersonic laminar constant heat flux flat plate plots
Turbulent Flat Plate (Adiabatic SS) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip adiabatic wall at approximately y+ = 16.Mesh25,000 cells CMPS captures the compressible turbulent skin-friction and recovery-temperature response. Supersonic turbulent adiabatic flat plate plots
Turbulent Flat Plate (Cons T SS) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip constant-temperature wall at approximately y+ = 16.Mesh25,000 cells Skin friction, heat flux and near-cell temperature follow the compressible reference relations. Supersonic turbulent constant temperature flat plate plots
Turbulent Flat Plate (Cons HF SS) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip constant-heat-flux wall at approximately y+ = 16.Mesh25,000 cells CMPS follows the expected compressible aerodynamic and thermal development. Supersonic turbulent constant heat flux flat plate plots
Turbulent Flat Plate (Adiabatic SS y+) Test Case Boundary conditionsSupersonic freestream inlet and far-field; supersonic outlet; no-slip adiabatic wall with y+ from 1 to 256.Mesh25,000 cells for each y+ subcase The skin-friction comparison shows the consistency and limits of the compressible wall treatment across the y+ sweep. Supersonic turbulent y plus plots
Experimental evidence

Experimental validation cases

Direct comparisons with wind-tunnel or laboratory measurements.

Axisymmetric HB2 Test Case

An axisymmetric HB-2 external-aerodynamics benchmark at Mach 3.

Boundary conditions

Mach-3 supersonic far-field; axis condition on the centreline; body wall; downstream far-field or outlet.

Mesh

13,761 cells

Validation basis

The drag coefficient is compared with the published wind-tunnel correlation.

Result

The CMPS Mach-3 point lies close to the measured drag trend.

HB2 wind tunnel drag comparison and Mach field
Wind-tunnel drag comparison and Mach field. Select to enlarge.

RAE2822 Transonic Airfoil Test Case

A two-dimensional turbulent transonic external-flow benchmark around the RAE2822 airfoil.

Boundary conditions

Transonic far-field around the airfoil; no-slip airfoil wall; downstream and outer pressure far-field boundary.

Mesh

20,061 cells

Validation basis

The surface aerodynamic distribution is compared directly with RAE2822 wind-tunnel measurements.

Result

CMPS reproduces the measured surface trend and the transonic shock region.

RAE2822 wind tunnel comparison and Mach field
Wind-tunnel surface comparison and Mach field. Select to enlarge.

Mixing Layer Test Case

A steady turbulent compressible mixing layer between two streams with different velocities.

Boundary conditions

Two inlet streams; upper and lower free-stream boundaries; downstream outlet.

Mesh

10,800 cells

Validation basis

The transverse velocity profile is compared with the Goebel-Dutton experiment.

Result

CMPS captures the measured velocity transition and shear-layer location.

Mixing layer experimental velocity comparison and field
Experimental velocity comparison and velocity field. Select to enlarge.

Supersonic Combustion (BK) Test Case

A two-dimensional Burrows-Kurkov supersonic mixing benchmark; the inert-gas configuration is used for validation.

Boundary conditions

Separate vitiated-air and inert-gas inlet streams; duct walls; downstream outlet.

Mesh

17,180 cells

Validation basis

H2, N2 and H2O mass-fraction profiles, together with the reported total-temperature measurements.

Result

The CMPS species profiles reproduce the measured mixing development.

Burrows Kurkov measured species profiles and Mach field
Measured species fractions and Mach field. Select to enlarge.

Shock Reflection In Supersonic Flow Test Case

A SCRAMJET-exhaust representation in which a supersonic jet produces a reflected shock over an afterbody.

Boundary conditions

Supersonic nozzle or exhaust inlet; constant-temperature afterbody wall; external far-field or outlet; mixture and multispecies formulations.

Mesh

29,000 cells for the mixture case; 49,960 cells for the multispecies case.

Validation basis

Only the measured pressure distribution is used. Heat transfer is excluded because it was not evaluated with the constant-temperature wall setup.

Result

Both formulations reproduce the principal measured pressure rise associated with shock reflection.

Shock reflection measured pressure comparison and Mach fields
Measured pressure comparison and Mach fields. Select to enlarge.

Backward Facing Step Flow with Particle

A two-dimensional steady turbulent dispersed-particle flow over a backward-facing step.

Boundary conditions

Carrier-flow and particle inlet; no-slip channel and step walls; downstream outlet; coupled dispersed-phase transport.

Mesh

30,000 cells

Validation basis

Particle-velocity profiles are compared with measurements at x = 0.225, 0.275, 0.375 and 0.425.

Result

CMPS captures the measured particle acceleration and recovery through the separated-flow region.

Backward facing step particle velocity measurements and field
Experimental particle-velocity profiles and particle field. Select to enlarge.