A 3D compressible nonhydrostatic dynamic core based on a three-point multi-moment constrained finite-volume (MCV) method is developed by extending the previous 2D nonhydrostatic atmospheric dynamics to 3D on a terrain...A 3D compressible nonhydrostatic dynamic core based on a three-point multi-moment constrained finite-volume (MCV) method is developed by extending the previous 2D nonhydrostatic atmospheric dynamics to 3D on a terrainfollowing grid. The MCV algorithm defines two types of moments: the point-wise value (PV) and the volume-integrated average (VIA). The unknowns (PV values) are defined at the solution points within each cell and are updated through the time evolution formulations derived from the governing equations. Rigorous numerical conservation is ensured by a constraint on the VIA moment through the flux form formulation. The 3D atmospheric dynamic core reported in this paper is based on a three-point MCV method and has some advantages in comparison with other existing methods, such as uniform third-order accuracy, a compact stencil, and algorithmic simplicity. To check the performance of the 3D nonhydrostatic dynamic core, various benchmark test cases are performed. All the numerical results show that the present dynamic core is very competitive when compared to other existing advanced models, and thus lays the foundation for further developing global atmospheric models in the near future.展开更多
探讨了防火板芯纸的浆料配比和湿强剂添加工艺,考察了加填对纸张湿强度和吸水高度的影响,初步确定了防火板芯纸合适的工艺条件。在现有瓦楞原纸浆料配比的基础上,通过降低秸秆化机浆比例,添加10%的自制本色化学浆,纸张湿强度和吸水高度...探讨了防火板芯纸的浆料配比和湿强剂添加工艺,考察了加填对纸张湿强度和吸水高度的影响,初步确定了防火板芯纸合适的工艺条件。在现有瓦楞原纸浆料配比的基础上,通过降低秸秆化机浆比例,添加10%的自制本色化学浆,纸张湿强度和吸水高度得到明显改善;当湿强剂用量80 k g/t纸、滑石粉加填比例10%时,防火板芯纸的湿强度和吸水速度可以满足后续加工要求。展开更多
基金supported by the National Key Research and Development Program of China (Grant Nos. 2017YFC1501901 and 2017YFA0603901)the Beijing Natural Science Foundation (Grant No. JQ18001)
文摘A 3D compressible nonhydrostatic dynamic core based on a three-point multi-moment constrained finite-volume (MCV) method is developed by extending the previous 2D nonhydrostatic atmospheric dynamics to 3D on a terrainfollowing grid. The MCV algorithm defines two types of moments: the point-wise value (PV) and the volume-integrated average (VIA). The unknowns (PV values) are defined at the solution points within each cell and are updated through the time evolution formulations derived from the governing equations. Rigorous numerical conservation is ensured by a constraint on the VIA moment through the flux form formulation. The 3D atmospheric dynamic core reported in this paper is based on a three-point MCV method and has some advantages in comparison with other existing methods, such as uniform third-order accuracy, a compact stencil, and algorithmic simplicity. To check the performance of the 3D nonhydrostatic dynamic core, various benchmark test cases are performed. All the numerical results show that the present dynamic core is very competitive when compared to other existing advanced models, and thus lays the foundation for further developing global atmospheric models in the near future.
文摘探讨了防火板芯纸的浆料配比和湿强剂添加工艺,考察了加填对纸张湿强度和吸水高度的影响,初步确定了防火板芯纸合适的工艺条件。在现有瓦楞原纸浆料配比的基础上,通过降低秸秆化机浆比例,添加10%的自制本色化学浆,纸张湿强度和吸水高度得到明显改善;当湿强剂用量80 k g/t纸、滑石粉加填比例10%时,防火板芯纸的湿强度和吸水速度可以满足后续加工要求。
