Difficult to predict in general. But, you can model parts of it (only inductors etc) in HFSS, and study them as an antenna. You can plot the radiated field, and convert it into dBuV, and compare with the FCC/CISPR limits. I can be any 3D simulation software, like CST, Comsol etc in place of HFSS. 

An assessment of conducted emissions can be done using Spice. This is comparatively easy - it can be done with abstracted building blocks of your circuit modeled as voltage sources.

Simulating radiated emissions requires the reproduction of your actual physical circuit. For this I have no recommendation.

This task is really complicated and all commercial packages are still struggling to get accurate results when the subject matter involves EMC of PCBs - progress is still ongoing. There are lots of complications regarding correct modeling (devices, components, harnesses, etc), so care must be taken when analyzing what they promise and what is delivered.

Little old post but if you can take look at www.simyog.com. They simulate EMC stndards like CISPR.

Hi Geethi Krishnan

For power electronics components/devices, the SPICE model-related software (e.g. LTspice, PSpice) is recommended. However, for power electronics circuits/systems, the SPICE model-related software is usually unable. In the meantime, the conventional simulation software (e.g. Simulink) is difficult to include the high-frequency characteristics of the circuits/systems. As a solution, we can construct a "black box (equivalent) model" of a power electronics system for its EMI estimation and prediction. Below shows some our previous publictaions in this topic:

[1] M. Prajapati, F. Fan, Z. Zhao*, and K. Y. See, “Estimation of radiated emissions from PV system through black boxes approach,” IEEE Transactions Instrum. Meas., vol. 70, 2021, Art no. 9004304.

[2] Y. Liu*, K. Y. See, S. Yin, R. Simanjorang, A. K. Gupta, and J. S. Lai, "Equivalent circuit model of high power density SiC converter for common-mode conducted emission prediction and analysis," IEEE Electromagnetic Compatibility Magazine, vol. 8, no. 1, pp. 67-74, 2019.

[3] Y. Liu*, K. Y. See, and K. J. Tseng, "Conducted EMI prediction of the PFC converter including nonlinear behavior of boost inductor", IEEE transactions on electromagnetic compatibility, vo. 55, no. 6, pp. 1107-1114, 2013.