![]() ![]() One solution was to remesh the model, I did that for a simple 2D it was working, but for the 3D model, the RAM memory is not supporting the calculations (I am using a 32 GB RAM memory). I found some solutions, since it was the problem that many users are being faced. Accordingly, the other calculation including production mass flux (rate) is not reliable and indeed logically they are far from the expected values. However, in such a calculation, there is a point that when I am calculating the mass flux for injection well it is far different from the imposed value which I already sat. I sat a constant injection rate for the injection wellbore, and I interested in calculating the production rate on the production wellbore. I am using surface integral technique to compute the mass flux in my doublet system in which there are two cylindrical shape wellbores, one of which is injection and the other one is production in a porous media. Try It Yourselfĭownload the MPH-file accompanying this blog post by clicking the button below, which will take you to the Application Gallery. For further reading about energy balances in COMSOL Multiphysics, please have a look at the Heat Transfer Module user’s guide. Predefined energy rate variables are easy to use, and you can avoid handling the calculation of the energy rate expressions by yourself.Īlthough we have used a specific example to demonstrate the topics covered in this blog post, the demonstrated method can be extended to any conjugate heat transfer problem. For this purpose, some useful derived value features have been introduced. We have also taken a look at how to calculate energy and mass balances with COMSOL Multiphysics in order to check the accuracy of simulation results. We have discussed the theory of mass and energy conservation for static as well as transient conjugate heat transfer problems. The results show good agreement.Įnergy rate versus time. \int_\Omega \frac, which should be, in the best case, zero. In fluid dynamics, mass conservation leads to a well-known local continuity equation: The chip acts as a heat source and generates 1 watt. In the model setup, the heat sink sits inside of a rectangular channel with an inlet and outlet for airflow. ![]() ![]() The heat sink is made of aluminum, shaped with a cluster of pillars for cooling, and mounted on a chip that is made of a silica glass material. This tutorial model is available in its steady-state version in the COMSOL Multiphysics Application Library if you have the Heat Transfer Module or CFD Module. To demonstrate the different topics covered in this blog post, I’ll use the example of an aluminum heat sink, which is often used to cool off electrical devices by dissipating heat. Here, I will demonstrate how to perform these calculations in the COMSOL Multiphysics® software and introduce some predefined variables available for postprocessing the energy rate terms of the energy balance equation. ![]() As a technical support engineer, one of the most common technical questions I receive is: “How can I compute the mass conservation of a fluid flow simulation or the energy balance of a conjugate heat transfer simulation?” This is often requested to investigate and ensure a simulation’s accuracy. ![]()
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