论文部分内容阅读
The second-order moment combustion model,proposed by the authors is validated using the directnumerical simulation(DNS)of incompressible turbulent reacting channel flows.The instantaneous DNS resultsshow the near-wall strip structures of concentration and temperature fluctuations.The DNS statistical results givethe budget of the terms in the correlation equations,showing that the production and dissipation terms are mostimportant.The DNS statistical data are used to validate the closure model in RANS second-order moment(SOM)combustion model.It is found that the simulated diffusion and production terms are in agreement with the DNSdata in most flow regions,except in the near-wall region,where the near-wall modification should be made,and theclosure model for the dissipation term needs further improvement.The algebraic second-order moment(ASOM)combustion model is well validated by DNS.
The second-order moment combustion model, proposed by the authors is validated using the direct numerical simulation (DNS) of incompressible turbulent reacting channel flows.The instantaneous DNS resultsshow the near-wall strip structures of concentration and temperature fluctuations. The DNS statistical results give the budget of the terms in the correlation equations, showing that the production and dissipation terms are mostimportant. The DNS statistical data are used to validate the closure model in RANS second-order moment (SOM) combustion model. It is found that the simulated diffusion and production terms are in agreement with the DNSdata in most flow regions, except in the near-wall region, where the near-wall modification should be made, and the closure model for the dissipation term needs further improvement. algebraic second-order moment (ASOM) combustion model is well validated by DNS.