Supersonic Flow over 15° Ramp — Welcome to LS-DYNA Examples

Home » Knowledge Base » CESE / DUAL-CESE » Examples DUAL-CESE » Supersonic Flow over 15° Ramp

This is a well known verification model for shock wave capture. A supersonic flow over a 15° ramp is modeled, and because of the ramp, an oblique shock wave is formed. The Inlet Mach number is about 2.5, density is 1.22 kg/m3 and temperature is 289 K.

Description

This is a well known verification model for shock wave capture. A supersonic flow over a 15° ramp is modeled, and because of the ramp, an oblique shock wave is formed. The Inlet Mach number is about 2.5, density is 1.22 kg/m3 and temperature is 289 K.

References:

[1] “ANSY Fluid Dynamics verification Manual”, 2019 R3.

Animated Result

flow_over_ramp_CFD2D_pre (1).gif

Keywords

*DUALCESE_MODEL

*DUALCESE_CONTROL_SOLVER

*DUALCESE_CONTROL_TIMESTEP

*DUALCESE_CONTROL_LIMITER

*DUALCESE_INCLUDE_MODEL

*DUALCESE_BOUNDARY_PRESCRIBED_SEGMENT_SET

*DUALCESE_BOUNDARY_NON_REFLECTIVE_SEGMENT_SET

*DUALCESE_BOUNDARY_REFLECTIVE_SEGMENT_SET

*DUALCESE_BOUNDARY_SOLID_WALL_SEGMENT_SET

*DUALCESE_INITIAL

*DUALCESE_PART

*DUALCESE_MAT_GAS

*DUALCESE_EOS_IDEAL_GAS

*DUALCESE_D3PLOT

*CONTROL_TERMINATION

*DATABASE_BINARY_D3PLOT

*DATABASE_BINARY_D3DUMP

 

Reduced Input

*KEYWORD

$*TITLE

$flow_to_a_slope

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

*DUALCESE_CONTROL_SOLVER

$    ieqns     igeom iframeref

Euler        2D     fixed

$       NS        2D     fixed

*DUALCESE_CONTROL_TIMESTEP

$#    iddt       cfl     dtint

2       0.9   1.0E-12

*DUALCESE_CONTROL_LIMITER

$#   idlmt      alfa     beta       epsr

0       1.0      1.0      .0001

$

*DUALCESE_INCLUDE_MODEL

fluid_mesh2.k

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

*DUALCESE_BOUNDARY_PRESCRIBED_SEGMENT_SET

$#    ssid    idcomp

1         0

$#    lc_u      lc_v      lc_w    lc_rho      lc_p      lc_t

0         0         0                 0         -1

$#    sf_u      sf_v      sf_w    sf_rho      sf_p      sf_t

852.68     0.000     0.000      1.22  101226.4    288.88

*DUALCESE_BOUNDARY_NON_REFLECTIVE_SEGMENT_SET

$#    ssid

2

*DUALCESE_BOUNDARY_REFLECTIVE_SEGMENT_SET

$#    ssid

5

$*DUALCESE_BOUNDARY_SOLID_WALL_SEGMENT_SET

$#    ssid      lcid        vx        vy        vz

3         0     0.000     0.000     0.000

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

*DUALCESE_INITIAL

$#       u         v         w       rho         p         t

852.68     0.000     0.000      1.22  101226.4    288.88

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

$ Setup fluid properties

$

*DUALCESE_PART

$      pid       mid     eosid

1         7         1

*DUALCESE_MAT_GAS

$      mid        c1        c2      prnd

70.81295e-8     110.4      0.70

*DUALCESE_EOS_IDEAL_GAS

$#   eosid        cv        cp

1   717.755 1004.8586

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

$ Handle output of flow variables

*DUALCESE_D3PLOT

density

pressure

velocity

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

*END

Download