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[求助]
fluent非穩(wěn)態(tài)計(jì)算兩秒后出現(xiàn)不收斂，求指點(diǎn)，謝謝哦
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大哥大姐們大家好。 fluent非穩(wěn)態(tài)計(jì)算噴霧蒸發(fā)，用的是dpm模型，為什么噴嘴工作2秒后才開始出現(xiàn)間歇性的不收斂呢？ 幾何模型長(zhǎng)為1米、直徑為0.22米的圓柱，噴嘴設(shè)置在中間，網(wǎng)格數(shù)為10萬(wàn)，并對(duì)噴嘴附近加密；空氣從噴嘴的一端以1m/s的速度流入；噴嘴為壓力旋轉(zhuǎn)噴嘴，噴嘴直徑為0.001m，壓力為1MPa，流量為0.002kg/s。前面2秒每步都能收斂，但2秒后間歇性出現(xiàn)不收斂，有遇到我這種情況的嗎？求指導(dǎo)。 謝謝哦 |
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說(shuō)這么多還不如圖說(shuō)的方便，你算的什么樣，模型，收斂曲線，把圖放上來(lái)，另外，你對(duì)收斂的定義是什么，通過(guò)什么方式來(lái)判斷。對(duì)于有的邊界條件，收斂曲線是永遠(yuǎn)達(dá)不到你設(shè)置的要求，有的即使達(dá)到了也未必就是收斂結(jié)果，取決于你的初始邊界條件，算法等很多方面。Fluent 里面是這么說(shuō)的》 Note: There are no universal metrics for judging convergence. Residual definitions that are useful for one class of problem are sometimes misleading for other classes of problems. Therefore it is a good idea to judge convergence not only by examining residual levels, but also by monitoring relevant integrated quantities and checking for mass and energy balances. There are three indicators that convergence has been reached: 1，The residuals have decreased to a sufficient degree. The solution has converged when the Convergence Criterion for each variable has been reached. The default criterion is that each residual will be reduced to a value of less than , except the energy residual, for which the default criterion i,10e-6 . 2,The solution no longer changes with more iterations. Sometimes the residuals may not fall below the convergence criterion set in the case setup. However, monitoring the representative flow variables through iterations may show that the residuals have stagnated and do not change with further iterations. This could also be considered as convergence. 3,The overall mass, momentum, energy, and scalar balances are obtained. You can examine the overall mass, momentum, energy and scalar balances in the Flux Reports dialog box. The net imbalance should be less than 0.2 of the net flux through the domain when the solution has converged. In the next step you will check to see if the mass balance indicates convergence. 假如你的初始條件足夠接近最終理論物理解，可以看這里 Sometimes, however, this criterion may not be appropriate. Typical situations are listed below. 1，If you make a good initial guess of the flow field, the initial continuity residual may be very small leading to a large scaled residual for the continuity equation. In such a situation it is useful to examine the unscaled residual and compare it with an appropriate scale, such as the mass flow rate at the inlet., 2，F(xiàn)or some equations, such as for turbulence quantities, a poor initial guess may result in high scale factors. In such cases, scaled residuals will start low, increase as non-linear sources build up, and eventually decrease. It is therefore good practice to judge convergence not just from the value of the residual itself, but from its behavior. You should ensure that the residual continues to decrease (or remain low) for several iterations (say 50 or more) before concluding that the solution has converged. GOOD LUCK! |
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