Here, we report on computational fluid dynamics (CFD) simulations conducted to develop a chemical sample collection device inspired by crayfish. The sensitivity of chemical sensors can be improved when used with a sniffing device. By collecting fluid samples from the surroundings, all solute species are also collected for the sensor. Crayfish generate jet-like water currents for this purpose. Compared to simply sucking water, food smells dissolved in the surrounding water can be more efficiently collected using the inflow induced by the jet discharge because of the smaller decay of the inflow velocity with the distance. Moreover, the angular range of water sample collection can be adjusted by changing the directions of the jet discharge. In our previous work, a chemical sample collection device that mimics the jet discharge of crayfish has been proposed. Here, we report CFD simulations of the flow fields generated by the device. By carefully configuring the simulation setups, we have obtained simulation results in which the angular ranges of the chemical sample collection in real experiments is well reproduced. Although there are still some discrepancies between the simulation and experimental results, such simulations will facilitate the process of designing such devices.

中文翻译：

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使用小龙虾启发的射流进行主动化学采样：射流排放装置产生的流场的CFD模拟。

在这里，我们报告为开发受小龙虾启发的化学样品收集装置而进行的计算流体动力学（CFD）模拟。与嗅探设备一起使用时，可以提高化学传感器的灵敏度。通过从周围环境中收集流体样本，还可以收集所有溶质物种用于传感器。为此，小龙虾会产生喷射状的水流。与简单地吸水相比，由于射流速度随距离的衰减较小，可以利用喷射流所引起的流入更有效地收集溶解在周围水中的食物气味。此外，可以通过改变喷射方向来调节水样收集的角度范围。在我们以前的工作中，已经提出了一种模仿小龙虾喷射排放的化学样品收集装置。在这里，我们报告由设备生成的流场的CFD模拟。通过精心配置模拟设置，我们获得了模拟结果，其中真实实验中化学样品收集的角度范围得到了很好的再现。尽管仿真和实验结果之间仍然存在一些差异，但此类仿真将有助于设计此类设备的过程。