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Japan Aerospace Exploration Agency

Digital/Analog-Hybrid Wind Tunnel (DAHWIN)

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April 1, 2013
DAHWIN goes into full-scale operations

After five years of development, DAHWIN is now complete and in full-scale operation as of April 2013. DAHWIN combines a conventional wind tunnel ("analog" wind tunnel) with numerical simulation technology ("digital" wind tunnel) to create a "Digital/Analog Hybrid WINd tunnel." ...[more]

By actually producing a flow of air, wind tunnel-based fluid experiments (EFD: Experimental Fluid Dynamics) make it possible to obtain highly reliable data but include problems like high preparation costs and limited information. Conversely, in recent years, the numerical simulation of flow fields using super-computers (CFD: Computational Fluid Dynamics) has enabled users to obtain large amounts of information at relatively low costs - but not always with adequate levels of reliability.
In response, JAXA's Digital/Analog-Hybrid Wind Tunnel (DAHWIN) predicts aerodynamic performance more accurately and makes the development of aerospace vehicles more efficient by fusing EFD and CFD in a complementary fashion.

The concept of Digital/Analog-Hybrid Wind Tunnel (DAHWIN)

DAHWIN makes it possible to perform the following types of analyses with higher precision and higher efficiency than ever before.

  1. (1) Improving wind tunnel data via CFD
    1. ⇒ Users can obtain wind tunnel data without the effects of walls or support systems
    2. ⇒ CFD compensates for the shortcomings of wind tunnel testing
  2. 2) Improving CFD via wind tunnel data
    1. ⇒ Makes it easy to use large amounts of wind tunnel data to validate CFD precision
    2. ⇒ Wind tunnel data improves CFD reliability
  3. (3) Checking wind tunnel/CFD data on the Internet
    1. ⇒ Enables participation in wind tunnel testing from remote locations
    2. ⇒ Improves the real-time capabilities and convenience of design development

Using DAHWIN: Example 1
(displaying EFD and CFD results together for quick comparison)

Using DAHWIN: Example 2
(support interference correction using CFD)

The development of DAHWIN began in FY2008. After applying for trial operations for the wind tunnel testing of re-entry capsule and D-SEND#2, the system was successfully completed at the end of FY2012. Currently, DAHWIN is operated in combination with the JAXA 2m x 2m transonic wind tunnel and the JAXA Supercomputer System (JSS). In addition to using DAHWIN in research and development activities, JAXA will contribute to the development of next-generation aircraft and spacecraft through DAHWIN.

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