Add a Monitoring Point to Fluent Fluid Domain to See Convergence Status at a Glance!-allcae

Problem Description

In Fluent simulation, setting point monitoring at key positions within the fluid domain, such as monitoring the temperature value at a point, primarily serves to assist in determining whether the calculation has converged. In steady-state calculations, the temperature curve of the monitoring point transitioning from drastic fluctuations to flattening out and stabilizing near a certain value is an intuitive basis for determining whether the flow field and temperature field have reached convergence, reflecting the actual stabilization of physical quantities more effectively than a single residual curve. In transient calculations, the variation trend of the temperature curve can also verify whether the flow and heat transfer processes change as expected. If the curve continues to oscillate without a stable trend, it indicates iterative divergence or issues with boundary conditions.

Method Introduction

In Fluent, before calculation, first create the points that need to be monitored. Find Create in Results.

Select Point in Create.

In Point Surface, define the name and coordinate position of this point. Once completed, you can see the specific position of this point in the model.

Then you also need to monitor the temperature at this point. Open Solution – Definitions – New – Surface Report – Vertex Average.

In the Surface Report Definition, set up temperature monitoring for this Point we created.

Through such settings, during the Fluent calculation process, the temperature at this point can be monitored in real time. In the early iteration stage (0-20 steps), the temperature shows small fluctuations, belonging to the initial adjustment phase of numerical calculation, which is normal. In the mid-iteration stage (20-40 steps), the temperature shows a drastic surge and decline, reaching a maximum near 67.5℃, then rapidly dropping. This is the typical process of coupled iteration between the flow field and temperature field, as the values seek a stable solution. In the late iteration stage (after 40 steps), the temperature quickly stabilizes at

around 50℃

, and the curve completely flattens out with no significant fluctuations. The temperature at the target point has stabilized at a fixed value in the late iteration stage, no longer changing with iteration steps, indicating that the local temperature field has reached a stable state. The process of the curve transitioning from fluctuation to stability also reflects the coupled iteration process of the flow field and temperature field, ultimately achieving the stabilization of physical quantities.

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