Skip to main content Skip to navigation

School of Engineering

Dr Seo Yoon Jung

First Thing to Do

  1. Simulation of Test Case 2 with 6 realisations (73%) - On going. (So far, Re=35000).
  2. Modification of the channel code for developing channel flow & Testing of Laminar channel flow. - Done.
  3. Simulation of fully-developed channel flow at Retau=180. - Done.
  4. Maximum for Um is 1.1582, and for u' is 0.1642, while my simulation has Um is 1.1579, and u' is 0.1677. So, Um is vertually the same, but u' is 2% smaller than mine.
  5. Modification of the channel code for boundary layer flow & Testing of laminar boundary layer. - Done.
  6. Modification of the channel code for active cancellation. - Done.
  7. Study of turbulent inflow generation and modification of the code. - Done.
  8. Simulation of turbulent boundary layer at Re_theta=300. - On going.

CSC MSc Modules

CY901 High Performance Scientific Computing (HPC)

Test Case

LES from Re=7,000 (Retau=230.0) to Re=45,200 (Retau=1190), with a ramp-up time of T=5 sec.

Reference variables

  • L=R, pipe radius,
  • U=laminar centreline velocity, 2*Um (Um=bulk velocity),
  • T=R/U
  • Then, Re=7,000 (Retau=228.6) to Re=45,200 (Retau=1168)

Test Case 1

  • Domain Size: (10R)
  • Grid points: 192*256*128 (r,theta,z)
  • dt: 0.002 (Total 27200 steps)
  • Ensemble: 4 realisations
  • 1D data: Every 680 timesteps, Total 40 sets
  • 3D data: Every 680 timesteps, Total 40 sets
  • Graphs

Test Case 2

  • Domain Size: (8R)
  • Grid points: 256*256*128 (r,theta,z)
  • dt: 0.001 to the 37500th step. After the 37500th step, dt=0.0005 (Total 54400 -> 71300 steps)
  • Ensemble: 8 realisations
  • 1D data: Every 500 timesteps, Total 100 sets
  • 3D data: Every 2500 timesteps, Total 20 sets
  • Re=7000, 14000, 21000, 28000, 35000 & 42000, 45200.
  • DT test: 0.001 and 0.0005

STEADY SIMULATION OF PIPE FLOW AT RE=4300 (RETAU=150)


  • Domain Size: (10R)
  • Grid points: 97*256*256 (r,theta,z)
  • dt: 0.003 (Total 60000 steps)
  • Re=4300 -> 8600

Fully-developed turbulent channel flow at Retau=180

  • Domain Size: (4pi*2*4/3pi)
  • Grid points: 128*129*128 (x,y,z)
  • dt: 0.03 (Total 25000 steps)
  • Graph

Inflow generation of Turbulent boundary layer at Retheta=300

  • Recycling method of Lund et al. (1998)
  • Domain Size: (80theta*30theta*40theta)
  • Inlet position: 280theta
  • Recycling position: 345theta (I=52)
  • Grid points: 64*65*64 (x,y,z)
  • dt: 0.3 (Total 20000 steps)
  • Graph

    Things to do